the radioactive decay of c14 which is used in estimating the age of archaeological after 2500 years, 0.0027 mol of c14 remain in the sample.
The amount of c14 remaining after 2500 years can be calculated using the first-order rate equation:
N(t) = N0 * e^(-kt)
where N0 is the initial amount of c14, N(t) is the amount remaining after time t, k is the decay constant, and e is the base of the natural logarithm. The half-life of c14 is given as 5725 years, which means that k can be calculated as:
k = ln(2)/t1/2 = ln(2)/5725
Substituting the values given in the problem, we get:
k = ln(2)/5725 = 1.21 * 10^-4 /year
Now, we can use the rate equation to find the amount of c14 remaining after 2500 years:
N(2500) = 0.0035 * e^(-1.21*10^-4 * 2500) = 0.0027 mol
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For another researcher's data the starting mass of apparatus + solid was 113.249 g. After the reaction was complete the apparatus was reweighed. The resulting mass was 113.276 g. Which of the following could have caused the mass gain?
Select all that apply
Group of answer choices
The apparatus had a gas leak and room air could enter the apparatus.
The apparatus picked up extra water droplets between weighings
They forgot to weigh the mass of the gas-generating solid before the reaction.
Matter was created in the reaction.
The mass gain that happened after the reaction could have been caused due to the matter was created in the reaction .
What is mass gain?
In physics, mass gain refers to an increase in mass in a chemical or nuclear reaction. It is the difference between the mass of the reactants and the mass of the products after a chemical reaction has occurred.
What happened in the given problem?
According to the given problem, the starting mass of the apparatus and solid was 113.249 g. After the reaction was complete, the apparatus was reweighed. The resulting mass was 113.276 g. The problem asks which of the following could have caused the mass gain.
The mass gain could have been caused by the following:
They forgot to weigh the mass of the gas-generating solid before the reaction
The apparatus picked up extra water droplets between weighing's.
Matter was created in the reaction.
The apparatus picked up extra water droplets between weighings, but they forgot to weigh the mass of the gas-generating solid before the reaction, and matter was created in the reaction.
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angela has an unknown quantity of gas held at a temperature of 2300 K in a container with a volume of 19 L and a pressure of 6.00 atm. How many moles of gas does angela have? a. what equation will you use? b. show all your work.
a gas has a volume of 91 ml at a temperature of 91oc. what is the volume of the gas if the temperature is reduced to 0oc at constant pressure?
If the temperature of the gas is reduced from 91°C to 0°C at constant pressure, the volume of the gas will decrease from 91 ml to 68.5 ml.
A gas has a volume of 91 ml at a temperature of 91°C. Use the combined gas law, which is a variation of the ideal gas law that holds pressure constant while allowing for changes in volume and temperature.
V1/T1 = V2/T2P = constant
Where V1 is the initial volume of the gas, T1 is the initial temperature of the gas, V2 is the final volume of the gas, T2 is the final temperature of the gas, and P is the constant pressure that the gas is held at.
We'll begin by plugging in the values that we know. V1 = 91 ml, T1 = 91°C, P = constant, V2 = ?, T2 = 0°C.
We can simplify the temperature values by converting them to Kelvin, since Kelvin is the temperature scale that is used in the gas laws. To convert Celsius to Kelvin, we simply add 273 to the Celsius value.
T1 = 91°C + 273 = 364 KT2 = 0°C + 273 = 273 KNow we can plug in the values and solve for V2. V1/T1 = V2/T2(91 ml)/(364 K) = V2/(273 K)Simplifying this equation, we get:V2 = (91 ml)(273 K)/(364 K)V2 = 68.5 ml
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I NEED HELP ON THIS ASAP!!!
Let me know if you need the link to the simulation.
The average atomic mass of a mixture of isotopes is affected by the relative abundance of each isotope in the mixture and the mass of each isotope.
The atomic masses of beryllium and fluorine are:
Beryllium-9: 9.012 amuFluorine-19: 18.998 amuThe average atomic mass of a sample containing three lithium-6 atoms and two lithium-7 atoms is 6.9418 amu.
What is the average atomic mass of isotopes of an element?The average atomic mass of an element is calculated by multiplying the masses of all of its isotopes by the element's relative natural abundance.
Using the atomic masses of lithium-6 (6.015 amu) and lithium-7 (7.016 amu), we can determine:
a. Atomic mass of lithium-6 = 6.015 amu
b. Atomic mass of lithium-7 = 7.016 amu
To calculate the average atomic mass of a sample containing three lithium-6 atoms and two lithium-7 atoms, we use the formula:
average atomic mass = [(mass of isotope 1 x number of atoms of isotope 1) + (mass of isotope 2 x number of atoms of isotope 2)] / total number of atoms
Substituting the values:
average atomic mass = [(6.015 amu x 3) + (7.016 amu x 2)] / 5
average atomic mass = 6.9418 amu
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Complete question:
1. What are the factors that affect the average atomic mass of a mixture of isotopes?
2. Beryllium (Be) and Fluorine (F) have only one stable isotope. Use the periodic table to complete the following table of the average atomic mass of one atom, two atoms, and three atoms of the isotopes
4. Lithium has only two stable isotopes. Use the sim to determine the following:
a. Atomic mass of lithium-6 = amu
b. Atomic mass of lithium-7= amu
c. Average atomic mass of a sample containing three lithium-6 atoms and two lithium-7 atoms = amu
the gas in a 225.0 ml piston experiences a change in pressure from 1.00 atm to 2.90 atm. what is the new volume (in ml) assuming the moles of gas and temperature are held constant? 7 7 . 5 9
Answer: The new volume of gas in the piston is 77.59 ml.
Given,Initial volume of gas in the piston = 225.0 ml Initial pressure of gas in the piston = 1.00 atmM Final pressure of gas in the piston = 2.90 atm. We have to find out the new volume of gas in the piston. Assuming that the moles of gas and temperature are held constant, we can use Boyle's Law to solve this problem.
Boyle's Law states that for a given amount of gas kept at a constant temperature, the volume of the gas is inversely proportional to its pressure. Mathematically, it can be represented as P1V1 = P2V2 where,P1 is the initial pressure of gasV1 is the initial volume of gas P2 is the final pressure of gas V2 is the final volume of gas
Let's substitute the given values in the above equation. P1V1 = P2V2225.0 × 1.00 = 2.90 × V2V2 = (225.0 × 1.00)/2.90V2 = 77.59 ml
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Select all that apply
Identify the cranial nerves associated with gastrointestinal tract motor output. Select all that apply.
vagus
trochlear
hypoglossal
facial
olfactory
glossopharyngeal
The cranial nerves associated with gastrointestinal tract motor output are vagus nerve, glossopharyngeal nerve, and facial nerve. The correct options are option A, D, and F.
Cranial nerves are the nerves that emanate directly from the brain. There are 12 pairs of cranial nerves. These nerves are responsible for transmitting sensory information such as vision, hearing, and touch as well as motor signals like movement and coordination to different parts of the body.
The cranial nerves that are responsible for gastrointestinal tract motor output are Vagus, Glossopharyngeal, and Facial.
The vagus nerve is the 10th cranial nerve and is one of the most critical nerves for gut activity. This nerve is a major parasympathetic supply to the upper GI tract, including the stomach and small intestine.
It has both motor and sensory fibers. The parasympathetic component of the vagus nerve promotes the release of acetylcholine, which stimulates the GI muscles to contract and propel food through the digestive tract.
The vagus nerve may also control some metabolic activities, including insulin release and glucose metabolism.
The glossopharyngeal nerve is the 9th cranial nerve and plays an essential role in controlling the muscles of the pharynx and throat. This nerve's motor component is responsible for activating the pharynx and upper esophageal sphincter when swallowing, which helps in propelling food through the GI tract.
The facial nerve is the 7th cranial nerve and plays a crucial role in controlling the muscles of facial expression. It also has a sensory component, which is responsible for taste perception in the anterior two-thirds of the tongue.
Additionally, it supplies parasympathetic fibers to the salivary and lacrimal glands, which are responsible for secreting enzymes and fluids that help in digestion.
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How many moles are in 6. 4 x 1024 molecules of HBr?
There are 1.06 moles in 6.4 x 10²⁴ molecules of HBr.
The chemical formula of hydrogen bromide is HBr. A mole is a unit of measurement that expresses the amount of a chemical substance that includes a fixed number of units of that substance. One mole of a substance is equal to the Avogadro number or 6.022 x 10²³ of that substance.In this problem, we need to figure out how many moles are in 6.4 x 10²⁴ molecules of HBr. We'll start by using Avogadro's number to convert the number of molecules to moles.
According to Avogadro's number, 6.022 x 10²³ molecules are in one mole.
Therefore, to figure out how many moles there are in 6.4 x 10²⁴ molecules,
we will use the following formula:
moles = number of molecules ÷ Avogadro's numbermoles = 6.4 x 10²⁴ ÷ (6.022 x 10²³)moles = 1.06 moles
So, there are 1.06 moles in 6.4 x 10²⁴ molecules of HBr.
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A sample of glucose reacts in anaerobic respiration. The right-hand box below shows a particle diagram of the moles of substances present after the reaction is complete.
On a piece of paper draw the "Before" box as shown and draw a particle diagram of the reactant molecules that produced the mixture shown on the right.
The balanced equation for anaerobic respiration that would obviously fit the model is; C6H12O6 ---->2C2H5OH + 2CO2
What is the equation of anaerobic respiration?The equation for anaerobic respiration (in the absence of oxygen) in humans and animals is:
Glucose → Lactic Acid + Energy (ATP)
The equation for anaerobic respiration (in the absence of oxygen) in plants and some microorganisms is:
Glucose → Ethanol + Carbon Dioxide + Energy (ATP).
Hence, we can see that this is way that anaerobic respiration occurs.
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The volume of 9.7 moles of an ideal gas at stop will be
The volume of 9.7 moles of an ideal gas at stop will be 218.8 L
What is volume of gas ?
To answer this question, we need to know the conditions of "stop." Assuming that you meant "STP" (standard temperature and pressure), which is defined as 0°C (273 K) and 1 atm (101.3 kPa), the volume of 9.7 moles of an ideal gas would be 218.8 L, according to the ideal gas law:
PV = nRT
where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature in Kelvin. At STP, the pressure is 1 atm and the temperature is 273 K. The value of R is 0.08206 L atm/mol K.
Therefore, V = nRT/P = (9.7 mol)(0.08206 L atm/mol K)(273 K)/(1 atm) = 218.8 L.
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Complete question is: The volume of 9.7 moles of an ideal gas at stop will be 218.8 L.
Hello, can someone help me with this AS level chemistry question?
An unknown alcohol is analysed by complete combustion.
When 0.250g of the alcohol is burned, 0.625g of carbon dioxide and 0.307g of water are produced.
Calculate the empirical formula of the alcohol. (5 marks)
Answer:
C5H6
Explanation:
Alcohol formula calculation
To find the empirical formula, we need to divide the number of moles of each element by the smallest number of moles.
The ratio of carbon to hydrogen in the empirical formula is 1:1.20.
To get whole numbers, we can multiply both numbers by 5.
The empirical formula of the alcohol is C5H6.
Formula used: moles = mass / molar mass
Name of formula: Mole calculation
What to watch: Make sure to use the molar masses of the correct compounds.
To determine the empirical formula of the alcohol, we need to find the mole ratios of the elements in the compound.
First, we can find the number of moles of carbon dioxide produced:
moles of CO2 = mass of CO2 / molar mass of CO2
moles of CO2 = 0.625 g / 44.01 g/mol
moles of CO2 = 0.0142 mol
Next, we can find the number of moles of water produced:
moles of H2O = mass of H2O / molar mass of H2O
moles of H2O = 0.307 g / 18.02 g/mol
moles of H2O = 0.0170 mol
The alcohol undergoes complete combustion, so all of the carbon in the alcohol combines with oxygen to form carbon dioxide, and all of the hydrogen in the alcohol combines with oxygen to form water. Therefore, the number of moles of carbon in the alcohol is equal to the number of moles of carbon dioxide produced, and the number of moles of hydrogen in the alcohol is equal to the number of moles of water produced.
moles of C in alcohol = moles of CO2 = 0.0142 mol
moles of H in alcohol = moles of H2O = 0.0170 mol
To find the empirical formula, we need to divide the number of moles of each element by the smallest number of moles:
C: 0.0142 mol / 0.0142 mol = 1
H: 0.0170 mol / 0.0142 mol = 1.20
The ratio of carbon to hydrogen in the empirical formula is 1:1.20. We can multiply both numbers by 5 to get whole numbers:
C: 1 × 5 = 5
H: 1.20 × 5 = 6
Therefore, the empirical formula of the alcohol is C5H6.
Alcohol formula calculation.
To determine the empirical formula of the alcohol, we need to find the mole ratios of the elements in the compound.
First, we can find the number of moles of carbon dioxide produced:
moles of CO2 = mass of CO2 / molar mass of CO2
moles of CO2 = 0.625 g / 44.01 g/mol
moles of CO2 = 0.0142 mol
Next, we can find the number of moles of water produced:
moles of H2O = mass of H2O / molar mass of H2O
moles of H2O = 0.307 g / 18.02 g/mol
moles of H2O = 0.0170 mol
The alcohol undergoes complete combustion, so all of the carbon in the alcohol combines with oxygen to form carbon dioxide, and all of the hydrogen in the alcohol combines with oxygen to form water. Therefore, the number of moles of carbon in the alcohol is equal to the number of moles of carbon dioxide produced, and the number of moles of hydrogen in the alcohol is equal to the number of moles of water produced.
moles of C in alcohol = moles of CO2 = 0.0142 mol
moles of H in alcohol = moles of H2O = 0.0170 mol
To find the empirical formula, we need to divide the number of moles of each element by the smallest number of moles:
C: 0.0142 mol / 0.0142 mol = 1
H: 0.0170 mol / 0.0142 mol = 1.20
The ratio of carbon to hydrogen in the empirical formula is 1:1.20. We can multiply both numbers by 5 to get whole numbers:
C: 1 × 5 = 5
H: 1.20 × 5 = 6
Therefore, the empirical formula of the alcohol is C5H6.
Alcohol formula calculation.
To determine the empirical formula of the alcohol, we need to find the mole ratios of the elements in the compound.
First, we can find the number of moles of carbon dioxide produced:
moles of CO2 = mass of CO2 / molar mass of CO2
moles of CO2 = 0.625 g / 44.01 g/mol
moles of CO2 = 0.0142 mol
Next, we can find the number of moles of water produced:
moles of H2O = mass of H2O / molar mass of H2O
moles of H2O = 0.307 g / 18.02 g/mol
moles of H2O = 0.0170 mol
The alcohol undergoes complete combustion, so all of the carbon in the alcohol combines with oxygen to form carbon dioxide, and all of the hydrogen in the alcohol combines with oxygen to form water. Therefore, the number of moles of carbon in the alcohol is equal to the number of moles of carbon dioxide produced, and the number of moles of hydrogen in the alcohol is equal to the number of moles of water produced.
moles of C in alcohol = moles of CO2 = 0.0142 mol
moles of H in alcohol = moles of H2O = 0.0170 mol
To find the empirical formula, we need to divide the number of moles of each element by the smallest number of moles:
C: 0.0142 mol / 0.0142 mol = 1
H: 0.0170 mol / 0.0142 mol = 1.20
The ratio of carbon to hydrogen in the empirical formula is 1:1.20. We can multiply both numbers by 5 to get whole numbers:
C: 1 × 5 = 5
H: 1.20 × 5 = 6
Therefore, the empirical formula of the alcohol is C5H6.
ChatGPT
The molecular formula of a compound is the whole number multiple of its empirical formula. The empirical formula is the simplest formula. Here the empirical formula of the alcohol is C₅H₆.
What is empirical formula?The empirical formula of a compound is defined as the formula which gives the simplest whole number ratio of atoms of various elements present in one molecule of the compound.
In order to find out the empirical formula of the alcohol, we need to find the mole ratios of the elements in the compound.
moles of CO₂ = mass of CO₂ / molar mass of CO₂
moles of CO₂ = 0.625 g / 44.01 g/mol
moles of CO₂ = 0.0142 mol
Next, we can find the number of moles of water produced:
moles of H₂O = mass of H₂O / molar mass of H₂O
moles of H₂O = 0.307 g / 18.02 g/mol
moles of H₂O = 0.0170 mol
To find the empirical formula, we need to divide the number of moles of each element by the smallest number of moles:
C: 0.0142 mol / 0.0142 mol = 1
H: 0.0170 mol / 0.0142 mol = 1.20
The ratio of carbon to hydrogen in the empirical formula is 1:1.20. We can multiply both numbers by 5 to get whole numbers:
C: 1 × 5 = 5
H: 1.20 × 5 = 6
Thus the empirical formula of the compound is C₅H₆.
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when 0.0400 mol koh is added to 1.0 l of a solution that is 0.25 m in nh3 and 0.20 m in nh4no3, the ph increases only slightly. which statement best explains this? g
When 0.0400 mol KOH is added to 1.0 L of a solution that is 0.25 M in NH3 and 0.20 M in NH4NO3, the pH increases only slightly.
The statement that best explains this is that the weak acid (NH4+) will combine with OH- to create a weak base (NH3). Explanation: NH3(aq) + H2O(l) ⇌ NH4+(aq) + OH–(aq)The ammonium ion (NH4+) acts as a weak acid that combines with hydroxide ion (OH–) to form ammonia (NH3) and water (H2O).
It is important to remember that ammonia is not strong enough to raise the pH significantly and that ammonium is a weak acid that won't produce a lot of hydroxides. Therefore, the pH change will be negligible. The explanation for the above reaction is as follows: NH4+ + OH– ⇌ NH3 + H2O In this equilibrium, the weak acid (NH4+) will combine with OH– to create a weak base (NH3), resulting in the pH not rising significantly.
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barium has a density of and crystallizes with the body-centered cubic unit cell. calculate the radius of a barium atom.
The radius of a barium atom is 2.68 Å.
Barium is a chemical element that is silvery-white in color and can be found in the periodic table with the symbol Ba.
The density of barium is 3.51 g/cm3, and it has a body-centered cubic unit cell that crystallizes.
Determine the length of the edge of the unit cell. Since barium has a body-centered cubic unit cell, the length of the edge of the unit cell:
Edge length = 4r /√3
Where r is the radius of the atom.
The volume of the unit cell using the formula:
Volume of unit cell = Edge length³
The number of atoms present in the unit cell. Since barium has a body-centered cubic unit cell, the number of atoms present in the unit cell :
Number of atoms in the unit cell = 2
The mass of a single atom of barium using the formula:
Mass of a single atom = Density of barium / Avogadro’s number
Where Avogadro’s number is 6.02 × 10²³ atoms/mol.
The radius of a barium atom using the formula:
Radius of barium atom = (3 × volume of unit cell / 4 × π × number of atoms in the unit cell)¹/³
The radius of the barium atom :
Edge length = 2r√3
r = (Edge length) / 2√3
Volume of the unit cell = (Edge length)³
Number of atoms in the unit cell = 2
Mass of a single atom = Density of barium / Avogadro’s number
Radius of barium atom = (3 × volume of unit cell / 4 × π × number of atoms in the unit cell)¹/³
Therefore, the radius of a barium atom is 2.68 Å.
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what term is used to describe the electrons in the outermost energy level
The term is used to describe the electrons present in the outermost energy level is the valence electrons.
The number of the electrons in the outermost shell of the particular atom that determines its reactivity, or the tendency to form the chemical bonds with the other atoms. This is the outermost shell and is known as valence shell, and the electrons present in it are called the valence electrons.
The electrons are on the outermost energy level of the atom are called the valence electrons. These are the electrons that involved in the bonding and the chemical reactions. The other electrons are the core electrons.
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the addition of low ionic strength solution (liss) to the testing environment when performing an indirect antiglobulin test is designed to do what?
The addition of low ionic strength solution (LISS) to the testing environment when performing an indirect antiglobulin test is designed to enhance the speed and sensitivity of the test.
The LISS solution reduces the time required for the agglutination reaction to occur between the patient's red blood cells (RBCs) and antiglobulin reagent (Coombs reagent).This reagent is an anti-human globulin (AHG) that attaches itself to the antibodies present on the RBCs' surface. The test is an indirect antiglobulin test, which involves incubating the patient's RBCs with a known anti-human globulin. The LISS solution's addition to the testing environment increases the speed and sensitivity of the test. It also helps in reducing the reaction time and helps detect antibodies that are present in low concentrations.
The LISS solution enhances the sensitivity of the antiglobulin test by reducing the ionic strength of the testing environment. This solution neutralizes the ionic charges on the surface of the RBCs, allowing the AHG to attach itself to the RBCs' antigens more efficiently. This, in turn, promotes more efficient agglutination and quicker antibody detection during the indirect antiglobulin test.
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how would the rf value of eugenol change if the mobile phase was changed to 40%ethyl acetate in hexanes? briefly explain your reasoning.
The RF value of eugenol will increase if the mobile phase is changed to 40% ethyl acetate in hexanes.
This is because the polarity of ethyl acetate is higher than that of hexanes, making it a better solvent for the eugenol to dissolve in. Therefore, the RF value will increase as the compound is able to move further up the TLC plate.
To illustrate, when the eugenol is placed on a TLC plate with a mobile phase consisting of 40% ethyl acetate in hexanes, the eugenol will dissolve in the ethyl acetate and migrate towards the top of the plate.
The RF value is the distance that the solvent front has traveled, in relation to the distance traveled by the compound, so it will be higher when the compound has been able to move further up the plate.
In conclusion, the RF value of eugenol will increase when the mobile phase is changed to 40% ethyl acetate in hexanes due to the higher polarity of the ethyl acetate, allowing the compound to move further up the TLC plate.
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if you wrote c6h11o5c6h11o6 as the molecular formula for sucrose, would that be correct? explain your answer.
Answer:
No the correct answer would be C12H22O11 this is because you have the same atoms listed in two different places.
Explanation:
Answer: If you wrote C6H11O5C6H11O6 as the molecular formula for sucrose, that would be incorrect. The correct molecular formula for sucrose is C12H22O11.
What is the correct molecular formula for sucrose?
The molecular formula for sucrose is C12H22O11. Sucrose is a disaccharide, which means it is made up of two simple sugar molecules. Sucrose is composed of one glucose molecule and one fructose molecule, which are bonded together by a glycosidic linkage between the anomeric carbon atoms.
If you wrote C6H11O5C6H11O6 as the molecular formula for sucrose, it would be incorrect because it doesn't accurately represent the composition of sucrose. The formula C6H11O5 represents a simple sugar molecule known as glucose, while the formula C6H11O6 represents another simple sugar molecule known as fructose. Sucrose, on the other hand, is made up of both glucose and fructose.
Therefore, the correct molecular formula for sucrose is C12H22O11.
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cola has a ph of about 3.0. if a cola has a concentration of h2co3 of 0.005m, what is the concentration of hco- g
cola has a ph of about 3.0. if a cola has a concentration of h2co3 of 0.005m then the concentration of HCO- ions is 1.58 x 10-4 M.
The given information is that a cola has a pH of about 3.0 and its H2CO3 concentration is 0.005M.
We have to determine the concentration of HCO- ions.
Given below is the balanced equation for the dissociation of carbonic acid
(H2CO3):H2CO3 → H+ + HCO-
pKa = 6.4 The dissociation constant, Ka can be calculated from the pKa as shown below:
Ka = 10(-pKa)Ka = 10(-6.4)Ka = 2.51 x 10-7
Now, we can write the equation for the ionization of H2CO3 as shown below:
H2CO3 + H2O → H3O+ + HCO3-
Here, the equilibrium constant, Ka can be defined as shown below:
Ka = [H3O+] [HCO3-] / [H2CO3]
Now, we can substitute the equilibrium concentrations in the above equation as shown below:
2.51 x 10-7 = [x] [x] / [0.005 - x]
On solving this equation, we get the value of x as 1.58 x 10-4 M.
Therefore, the concentration of HCO- ions is 1.58 x 10-4 M.
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what technique is used in this investigation? group of answer choices colorimetry calorimetry gas pressure measurements titration combustion analysis
The technique used in this investigation is titration.
Titration is a laboratory method used to determine the amount or concentration of a substance in a sample. A reagent, known as the titrant, is added to a solution to react with the substance being studied, known as the analyte. The titration endpoint is determined by observing an indicator's colour change or by performing a calculation.
Titration is a common method used in analytical chemistry for quantifying analytes' concentrations. Acid-base titrations, redox titrations, and complexometric titrations are some of the most common types of titrations used in chemistry labs. Titration is used to calculate the amount of acid, base, salt, or other substance in a sample.
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I NEED HELP ON THIS ASAP! PLEASE IT'S DUE TONIGHT!
The relative abundance of each isotope in the mixture and the isotopic mass of each isotope determines the average atomic mass of an element.
The average masses of the atoms of beryllium and fluorine are found in the attachment.
The average atomic mass of lithium is 6.9418 amu.
What is the average atomic mass of lithium?The average atomic mass of lithium is obtained from the isotopic mass and relative abundance of the two isotopes of lithium.
Isotopic mass of lithium-6 = 6.015 amu
Isotopic mass of lithium-7 = 7.016 amu
To calculate the average atomic mass, we use the formula:
average atomic mass = [(isotopic mass of isotope 1 x number of atoms of isotope 1) + ( isotopic mass of isotope 2 x number of atoms of isotope 2)] / total number of atoms
Substituting the values:
average atomic mass of lithium = [(6.015 amu x 3) + (7.016 amu x 2)] / 5
average atomic mass = 6.9418 amu
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Complete question:
1. What are the factors that affect the average atomic mass of a mixture of isotopes?
2. Beryllium (Be) and Fluorine (F) have only one stable isotope. Use the periodic table to complete the following table of the average atomic mass of one atom, two atoms, and three atoms of the isotopes
4. Lithium has only two stable isotopes. Use the sim to determine the following:
a. Atomic mass of lithium-6 = amu
b. Atomic mass of lithium-7= amu
c. Average atomic mass of a sample containing three lithium-6 atoms and two lithium-7 atoms = amu
How many atoms does O have
Answer:
8 atoms it have but u don't know
the electronic configuration of O2−is2s22p6.
Yes, it is true that the electronic configuration of O2- is 1s2 2s2 2p6.
What is meant by electronic configuration?Arrangement of electrons in orbitals around atomic nucleus is called electronic configuration and describes how electrons are distributed in its atomic orbitals.
When oxygen atom gains two electrons to form an O2- ion, the two electrons occupy the lowest energy level available, which is the 2s orbital. Therefore, the electronic configuration of O2- is the same as that of neon (1s2 2s2 2p6), which has a full outermost shell of electrons. This noble gas configuration makes the O2- ion stable and less likely to react with other elements.
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Hydrogen gas and oxygen gas are reacted together as shown below to produce water. Calculate the maximum theoretical yield of water if 40g of hydrogen is used and then use your answer to work out the percentage yield if the reaction actually produces 234g of water.
Since the percentage yield exceeds 100%, the actual yield obtained exceeds the theoretical value. This can be the result of flawed experiments or insufficient replies.
When 29g of Oxygen and 3g of Hydrogen are combined to produce water?The limiting reactant in the reaction between 3g of Hydrogen and 29g of Oxygen is hydrogen. Water formation can produce a maximum of 27 g. Five grammes of the reactant are still unreacted.
2Hydrogen + Oxygen → 2Water
moles of Hydrogen = mass / molar mass = 40 g / 2.016 g/mol = 19.84 mol
moles of Water = moles of Hydrogen / 2 = 19.84 mol / 2 = 9.92 mol
The molar mass of water is 18.015 g/mol, so the mass of water produced can be calculated as follows:
mass of Water = moles of Water × molar mass = 9.92 mol × 18.015 g/mol = 178.6 g
Therefore, the theoretical yield of water is 178.6 g.
The percentage yield can be calculated as follows:
% yield = (actual yield / theoretical yield) × 100%
% yield = (234 g / 178.6 g) × 100% = 131%
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the half-life of carbon is 5730 years. if you start with 724.8g of carbon, what mass of carbon will remain after 5730 years? please answer in grams and report your answer to one place past the decimal.
The mass of carbon that will remain after 5730 years is 362.4 grams.
The decay of carbon-14 follows first-order kinetics. The half-life of carbon-14 is 5730 years, which means that in 5730 years, half of the initial amount of carbon-14 will decay.
This can be expressed as:
[tex]N = N_0/2^{(t/T)}[/tex]
where:
[tex]N_0[/tex] is the initial amount of carbon
N is the final amount of carbon after t years
T is the half-life of carbon
In this case, we want to find the amount of carbon-14 remaining after one half-life, which is 5730 years. Therefore, we can substitute N0 = 724.8 g, t = 5730 years, and T = 5730 years into the equation:
We can substitute the given values into the formula:
[tex]N = 724.8/2^{(5730/5730)}[/tex]
= 362.4 g
Therefore, after one half-life, 362.4 g of carbon will remain.
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in a solution of dichloromethane (ch2cl2) in 2-pentanone (ch3coc3h7), the mole fraction of dichloromethane is 0.350. if the solution contains only these two components, what is the molality of dichloromethane in this solution?
The molality of dichloromethane in this solution is 6.25 m.
The molality of dichloromethane in a solution of dichloromethane and 2-pentanone is calculated using the formula:
molality (m) = moles of solute (mol) / kilograms of solvent (kg)
In this case, the solute is dichloromethane (CH₂Cl₂) and the solvent is 2-pentanone (CH₃COC₃H₇). The mole fraction of dichloromethane is 0.350, so there are 0.350 moles of dichloromethane in one mole of the solution.
To get the mass of solvent, we need to convert the number of its moles to mass by multiplying it with its molar mass. The molar mass of 2-pentanone (CH₃COC₃H₇), is the sum of the atomic weights of each element, which is 86.13 g/mol. One mole of the solution contains 0.350 moles of dichloromethane and 0.650 moles 2-pentanone. Therefore, the mass of 2-pentanone is:
mass = moles x molar mass = 0.650 moles x 86.13 g/mol = 55.9845 g
Solving for the molality, we get:
m = 0.350 moles / (5.9845 g)(1 kg/1000g)
m = 6.25 mol/kg = 6.25 m
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an unknown amine reacted with iodomethane and afforded the following tetraalkylammonium salt. what is the structure of the unknown amine?
The unknown amine reacted with iodomethane and afforded the following tetraalkylammonium salt.
The structure of the unknown amine is an aliphatic amine. An aliphatic amine is an organic compound with at least one nitrogen atom connected to alkyl groups. It may have single, double, or triple bonds between nitrogen and the carbon atoms of the alkyl group.
Aliphatic amines can be secondary, tertiary, or primary depending on the number of alkyl groups attached to the nitrogen atom.
In the case of the unknown amine, the number of alkyl groups connected to the nitrogen atom is four, meaning that it is a primary aliphatic amine. aliphatic amines have the general formula of RCH2NH2, where R represents a hydrocarbon chain.
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what is necessary for extraction? group of answer choices two phases in which the solute is equally soluble higher solute solubility in the second phase lower solute solubility in the second phase two phases in which the solute is equally insoluble
For extraction, there should be an option c) lower solute solubility in the second phase.
Extraction is a process in which a solute is separated from a solution or mixture by two immiscible liquid phases. It involves two phases in which the solute has different solubilities.
In the first phase, the solute has higher solubility, meaning it dissolves more readily.
In the second phase, the solute has lower solubility, meaning it is less likely to dissolve.
In order for extraction to be successful, the solute must be differently soluble in the phases. This ensures that the solute is separated efficiently and effectively.
The process of extraction involves the formation of two liquid phases and the transfer of the solute from one phase to the other. The solute is transferred from the first phase to the second phase, where it is separated from the solution.
To summarize, extraction is a process of separating a solute from a solution or mixture by two immiscible liquid phases. It involves two phases in which the solute has different solubilities.
Therefore, for extraction, it is necessary for the solute to have a lower solubility in the second phase. and hence the correct answer is option c.
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How many atoms are in 32.10 g of He
Taking into account the definition of Avogadro's Number, 4.83×10²⁴ atoms of He are in 32.10 g of He.
Definition of molar massThe molar mass of substance is a property defined as the amount of mass that a substance contains in one mole.
Definition of Avogadro's NumberAvogadro's Number is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole.
Its value is 6.023×10²³ particles per mole.
Amount of moles of 32.10 g of HeThe molar mass of He is 4 g/mole. You can apply the following rule of three: If by definition of molar mass 4 grams of He are contained in 1 mole of He, 32.10 grams of He are contained in how many moles?
moles= (32.10 grams × 1 mole)÷ 4 grams
moles= 8.025 moles
The amount of moles of He in 32.19 grams is 8.025 moles.
Amount of atoms of 32.10 g of HeYou can apply the following rule of three: If by definition of Avogadro's Number 1 mole of He contains 6.023×10²³ atoms, 8.025 moles of He contains how many atoms?
amount of atoms of He= (8.025 moles × 6.023×10²³ atoms)÷ 1 mole
amount of atoms of He= 4.83×10²⁴ atoms
Finally, 4.83×10²⁴ atoms of He are present.
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a solution of glucose in water has a concentration of 0.750 m. how many moles of solute are present in a volume of 352 ml?
The number of moles of solute is 0.264 moles.
The concentration of a solution can be determined by calculating the number of moles of solute present in a given volume. The concentration of a glucose solution given is 0.750 m, which means that there are 0.750 moles of glucose present in 1 liter of the solution.
To calculate the number of moles of solute present in 352 ml of this solution, we must first convert 352 ml to liters. This is done by dividing 352 by 1000, giving 0.352 liters.
To calculate the number of moles of glucose in this volume of solution, we must multiply 0.750 moles by 0.352 liters, giving 0.264 moles.
This means that in a volume of 352 ml of a solution with a concentration of 0.750 m, there are 0.264 moles of glucose present.
Therefore, the number of moles of solute present in a volume of 352 ml of glucose solution is 0.264 moles.
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Question at position 1
What is the pressure of gas if 2.89-g of CO2 sublimates in a 9.60-L container at 255.22K
1.63atm is the required pressure of the given gas.
The concept of ideal gas lawTo calculate the pressure of gas using the ideal gas law, we need to use the formula:
PV = nRT
where:
P = pressure of gasV = volume of gasn = number of moles of gasR = gas constant (0.08206 L·atm/mol·K)T = temperature of gas in KelvinFirst, we need to calculate the number of moles of CO2 using the given mass and molar mass:
n = m/M
where:
m = mass of CO2 = 2.89 g
M = molar mass of CO2 = 44.01 g/mol
n = 2.89 g / 44.01 g/mol = 0.0657 mol
Next, we can plug in the values into the ideal gas law and solve for pressure (P):
PV = nRT
P = nRT / V
P = (0.0657 mol) (0.08206 L·atm/mol·K) (255.22 K) / 9.60 L
P = 1.63 atm
Therefore, the pressure of the gas is 1.63 atm.
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a conductor is distinguished from an insulator with the same number of atoms by the number of: electrons protons nearly free atoms nearly free electrons molecules
A conductor is distinguished from an insulator with the same number of atoms by the number of: electrons protons nearly free atoms nearly free electrons molecules. This statement is true.
What Is A Conductor?The given statement "a conductor is distinguished from an insulator with the same number of atoms by the number of: electrons protons nearly free atoms nearly free electrons molecules" is true because a conductor is distinguished from an insulator with the same number of atoms by the number of nearly free electrons. A conductor is a substance that easily transmits heat or electricity through it. The reason why conductors do that is that they have free electrons available in their outer shells, so when a voltage is applied to them, the free electrons become excited and start to flow. On the other hand, an insulator is a substance that does not allow electricity or heat to flow through it. Insulators have a high amount of resistance, which means that they do not allow electrical current to pass through them.
The question was incomplete, but most probably your question was:
A conductor is distinguished from an insulator with the same number of atoms by the number of: electrons protons nearly free atoms nearly free electrons molecules (True/False)
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