If an electron is released during radioactive decay, the type of decay that has taken place is beta decay.
In beta decay, a neutron within the nucleus is converted into a proton, releasing an electron (also called a beta particle) in the process.
In alpha decay an alpha particle is emitted from the atomic nucleus and a new atomic nucleus is formed. So, no release of electron is there.
In gamma decay the unstable nuclei release excess energy by continuous electromagnetic process. This does not involve release of electron.
The electromagnetic decay also do not involve the release of an electron.
Thus option b is the correct answer.
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4. the bohr equation for the hydrogen atom is en = -2.18×10-18 j/n2. what is the energy in j of the lowest excited state?
a.2.42×10-19 b.1.66×10-18 c.5.45×10-19 d.2.18×10-19 e.2.18×10-18
The Bohr equation for the hydrogen atom is given by:
E = -2.18 × 10^-18 J/n^2
where E is the energy of the electron, and n is the principal quantum number.
The lowest energy level or ground state of hydrogen is when n = 1. So, we can find the energy of the lowest excited state by setting n = 2 in the Bohr equation:
E = -2.18 × 10^-18 J/2^2 = -0.54 × 10^-18 J
The energy of the lowest excited state is the difference between the energy of the ground state and the energy of the excited state. So, we can find the energy of the lowest excited state by subtracting the energy of the ground state (n=1) from the energy of the excited state (n=2):
ΔE = E₂ - E₁ = (-0.54 × 10^-18 J) - (-2.18 × 10^-18 J) = 1.64 × 10^-18 J
Therefore, the energy of the lowest excited state of hydrogen is 1.64 × 10^-18 J, which is closest to option (b) 1.66 × 10^-18 J.
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What is the molality of a solution of naphthalene dissolved in chloroform if the solution has a boiling point of 63. 2 °C?
The molality of the naphthalene solution in chloroform is approximately 0.551 mol/kg.
To calculate the molality of a solution of naphthalene dissolved in chloroform, we need to use the boiling point elevation formula: ΔTb = Kb * molality, where ΔTb is the change in boiling point, Kb is the boiling point elevation constant, and molality is the moles of solute per kilogram of solvent.
First, we need to find the change in boiling point (ΔTb) by subtracting the normal boiling point of chloroform from the given boiling point. The normal boiling point of chloroform is 61.2°C. Therefore, ΔTb = 63.2°C - 61.2°C = 2.0°C.
Next, we need to find the boiling point elevation constant (Kb) for chloroform. The Kb value for chloroform is 3.63 °C/kg/mol.
Now, we can use the boiling point elevation formula to solve for molality:
2.0°C = 3.63 °C/kg/mol * molality
Rearranging the equation and solving for molality, we get:
molality = 2.0°C / 3.63 °C/kg/mol = 0.551 mol/kg
Therefore, the molality of the naphthalene solution in chloroform is approximately 0.551 mol/kg.
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A sample of gas initially at 1. 4 atm and occupies 720 ml whats the final pressure in atm when the volume changes to 820 mL?
The final pressure of the gas when the volume changes from 720 mL to 820 mL is approximately 1.22 atm.
To solve this problem, we can use Boyle's Law, which states that the product of the initial pressure and volume (P1V1) is equal to the product of the final pressure and volume (P2V2) for a gas at a constant temperature:
P1V1 = P2V2
Given the initial pressure (P1) is 1.4 atm and the initial volume (V1) is 720 mL, we need to find the final pressure (P2) when the volume (V2) changes to 820 mL. Rearrange the formula to solve for P2:
P2 = P1V1 / V2
Substitute the given values:
P2 = (1.4 atm × 720 mL) / 820 mL
P2 ≈ 1.22 atm
Therefore, the final pressure of the gas is approximately 1.22 atm.
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The pressure at the bottom of a lake is 2. 35 atm. If water saturated with oxygen
(concentration 0,34 g/L) is carried by a current to to a depth where the solubility
of oxygen is 0. 21 g/L, what is the pressure of the water.
The pressure at the bottom of a lake is given as 2.35 atm, and we are asked to find the pressure of the water. Since water is the fluid in question, we can assume that it is incompressible and that its density is constant. To find the pressure of the water, we can use the following formula:
Pressure = Density x Acceleration due to gravity x Height
Here, the height refers to the depth of the lake, which we can assume to be the same as the height of the water column. The acceleration due to gravity is a constant, and the density of water is given as 0.21 g/L.
Substituting these values in the formula, we get:
Pressure = 0.21 g/L x 9.8 m/s^2 x Depth
Since the pressure at the bottom of the lake is given as 2.35 atm, we can convert this to SI units using the conversion factor:
1 atm = 101325 Pa
Therefore, 2.35 atm = 2.35 x 101325 Pa = 2.38 x 10^5 Pa
Substituting this value in the formula, we can solve for the depth:
2.38 x 10^5 Pa = 0.21 g/L x 9.8 m/s^2 x Depth
Depth = 114.7 m
Therefore, the pressure of the water at this depth is:
Pressure = 0.21 g/L x 9.8 m/s^2 x 114.7 m = 240.3 kPa
In conclusion, the pressure of the water at the bottom of the lake is 240.3 kPa. This is the pressure exerted by the water column due to its weight, and it is in addition to the atmospheric pressure. Understanding the pressure of fluids is important in many fields, such as hydrology, engineering, and physics.
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the acid-dissociation constant for benzoic acid (c6h5cooh) is 6.3 x 10-5. calculate the equilibrium concentrations of h3o c6h5coo-, and c6h5cooh in the solution if the initial concentration of c6h5cooh is 0.050 m.
At equilibrium, the concentrations of [tex]H_{3} O+, C_{6} H_{5}COO[/tex]-, and [tex]C_{6} H_{5}COO[/tex] in the solution will be 0.038 M, 0.038 M, and 0.012 M, respectively.
First, we can write the chemical equation for the dissociation of benzoic acid in water as follows: [tex]C_{6}H5COOH + H_{2}O[/tex] ⇌[tex]C_{6}H_{5}COO- + H_{3}O[/tex]
The acid dissociation constant, Ka, is given as 6.3 × 10^-5.
[tex]Ka = [C_{6}H_{5}COO-][H_{3}O+] / [C_{6}H_{5}COOH][/tex]
We can assume that the initial concentration of [tex]C_{6}H_{5}COOH[/tex] is equal to its concentration at equilibrium, x. Thus, at equilibrium:
[tex][C_{6}H_{5}COOH] = x M \\[/tex]
[tex][C_{6}H_{5}COO-] = y M \\[/tex]
[tex][H_{3}O+] = y M\\[/tex]
Using the equilibrium expression and the given value of Ka, we can solve for the values of x and y:
[tex]Ka = [C_{6}H_{5}COO-][H_{3}O+] / [C_{6}H_{5}COOH]\\6.3 * 10^-5 = y^2 / x[/tex]
Since we know that the initial concentration of benzoic acid is 0.050 M, we can write: [tex]x + y = 0.050 M[/tex]
Now we have two equations and two unknowns. Solving for x and y:
[tex]x = 0.012 M\\y = 0.038 M[/tex]
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0. 008 moles of C3H7OH contains how many atoms of carbon?
0.008 moles of C₃H₇OH contains 1.44528 x 10^22 atoms of carbon.
To find the number of carbon atoms in 0.008 moles of C₃H₇OH, follow these steps:
1. Identify the number of carbon atoms in one molecule of C₃H₇OH. In this case, there are 3 carbon atoms.
2. Calculate the total number of molecules in 0.008 moles of C₃H₇OH by multiplying the number of moles by Avogadro's constant (6.022 x 10^23 molecules/mol).
0.008 moles * (6.022 x 10^23 molecules/mol) = 4.8176 x 10^21 molecules
3. Multiply the total number of molecules by the number of carbon atoms in each molecule to find the total number of carbon atoms:
4.8176 x 10^21 molecules * 3 carbon atoms/molecule = 1.44528 x 10^22 carbon atoms
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how do you read an electron dot diagram?
When reading an electron dot diagram, you can determine the number of valence electrons an atom has and use that information to predict how it will bond with other atoms. Atoms tend to form bonds in order to achieve a full outer shell of electrons, which is the most stable arrangement. By looking at the number of dots in the electron dot diagram, you can predict how many bonds an atom is likely to form and what types of atoms it will bond with.
To read an electron dot diagram, you first need to understand what it represents. An electron dot diagram, also known as a Lewis structure, shows the number of valence electrons that an atom has. Valence electrons are the electrons in the outermost energy level of an atom and are involved in chemical bonding.
The dot diagram shows the symbol for the element surrounded by dots representing the valence electrons. Each dot represents one electron, and the dots are placed around the symbol in pairs, with no more than two dots on each side.
For example, carbon has four valence electrons, so its electron dot diagram would show four dots surrounding the symbol for carbon. Nitrogen, on the other hand, has five valence electrons, so its electron dot diagram would show five dots.
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HELP ALMOST DONE WILL MARK BRAINLIEST!!!!!!
8.
What is true concerning the concentrations of H3O+ and OH- ions in the acidic solutions?
There are more H3O+
There are fewer H3O+
They are in equal amounts
There are more hydroxide ions
9.
What is true concerning the concentrations of H3O+ and OH- ions in the basic solutions?
There are more H3O+
There are fewer H3O+
They are in equal amounts
There are more hydronium ions
Fe(NO3)2 + Al = Fe + Al(NO3)3 identify what's being oxidized and reduced
In the given chemical equation:
Fe(NO3)2 + Al → Fe + Al(NO3)3
Iron (Fe) is being reduced because it is gaining electrons and its oxidation state is decreasing from +2 to 0 (elemental state).
Aluminum (Al) is being oxidized because it is losing electrons and its oxidation state is increasing from 0 (elemental state) to +3.
Therefore, Fe(NO3)2 is the oxidizing agent, and Al is the reducing agent in this reaction.
What volume of dichloromethane (ch2cl2) is produced when 149 liters of methane (ch4) react according to the following reaction? (all gases are at the same temperature and pressure. ) methane (ch4)(g) carbon tetrachloride(g) dichloromethane (ch2cl2)(g)'
The volume of dichloromethane [tex](CH_2Cl_2)[/tex] produced when 149 liters of methane [tex](CH_4)[/tex] react according to the given reaction is approximately 6.224 x [tex]10^5 J/K*m^3[/tex].
The volume of dichloromethane [tex](CH_2Cl_2)[/tex] produced when 149 liters of methane [tex](CH_4)[/tex] react according to the given reaction is not immediately apparent from the reaction stoichiometry.
The balanced equation for the reaction between methane [tex](CH_4)[/tex] and carbon tetrachloride (CCl4) to form dichloromethane [tex](CH_2Cl_2)[/tex] and carbon dioxide (CO2) is:
[tex](CH_4)[/tex] + [tex]CO_2[/tex] → [tex](CH_2Cl_2)[/tex] + [tex]CO_2[/tex]
The balanced equation shows that 1 mole reacts with 1 mole of CCl4 to produce 1 mole of [tex](CH_2Cl_2)[/tex] and 1 mole of [tex]CO_2[/tex].
The volume of the gas can be calculated using the ideal gas law:
PV = nRT
To find the number of moles of gas, we can use the molecular masses of the reactants and products:
Molar mass of [tex](CH_4)[/tex] = 16.04 g/mol
Molar mass of [tex]CCl_4[/tex] = 89.9 g/mol
Molar mass of [tex](CH_2Cl_2)[/tex] = 70.1 g/mol
Molar mass of [tex]CO_2[/tex] = 44.01 g/mol
The number of moles of [tex](CH_4)[/tex] can be calculated from the initial amount of gas:
149 L of CH4 = 149 x 16.04 g/mol = 2432 g
The number of moles of CCl4 can be calculated from the given volume:
149 L of [tex](CH_4)[/tex] + [tex]CCl_4[/tex] → [tex](CH_2Cl_2)[/tex] + [tex]CO_2[/tex]
The volume of the gas is given as 149 L, so the number of moles of [tex]CCl_4[/tex] can be calculated as:
149 L = 149 x 89.9 g/mol = 13,277 g
The number of moles can be calculated from the given volume and the desired amount of product
149 L of [tex](CH_4)[/tex] + [tex]CCl_4[/tex] → [tex](CH_2Cl_2)[/tex] + [tex]CO_2[/tex]
149 L of [tex](CH_4)[/tex] + [tex]CCl_4[/tex] → 149 x 70.1 g/mol + 13,277 g x 1 mol/13.277 g = 43,691 g
V = nRT
V = 43,691 g x 8.314 J/mol·K = 364,617.5 J/K
1 J/K = 1/1000 L·K
Therefore, the volume of the gas is:
V = 364,617.5 J/K x (1/1000 L·K) = 3.646 x 10^4 L
substitute this value for V in the equation for the volume of [tex](CH_2Cl_2)[/tex] :
PV = nRT
PV = 149 x 8.314 J/mol·K x (3.646 x [tex]10^4[/tex] L)
PV = 6.224 x [tex]10^5 J/K*m^3[/tex].
Therefore, The volume of dichloromethane [tex](CH_2Cl_2)[/tex] produced when 149 liters of methane [tex](CH_4)[/tex] react according to the given reaction is approximately 6.224 x [tex]10^5 J/K*m^3[/tex].
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yellow scale lichen on rock
a population
On a rock in coastal Maine, the fungus, the algae, and the bacteria make up which of the
following? Select all that apply.
part of a community
Lichen growing on a rock in coastal
Maine may appear to be a single
organism. But lichen is actually
formed when algae and fungi grow
together.
part of an ecosystem
These different organisms live
together in a symbiotic relationship. In
the yellow scale lichen, the fungus
provides protection, moisture, and
nutrients for the algae. The algae
carry out photosynthesis to produce
food that is used by the fungus.
Different type of bacteria may also live
within the fungus.
WILL MARK BRAINIEST
On a rock in coastal Maine, the fungus, the algae, and the bacteria make up part of an ecosystem.
What is ecosystem?An ecosystem consists of all the organisms and the physical environment with which they interact.
In the yellow scale lichen, the fungus provides protection, moisture, and nutrients for the algae. The algae carry out photosynthesis to produce food that is used by the fungus.
Ecosystem function is generally described as the capacity of natural processes and components to provide goods and services that satisfy human needs, either directly or indirectly.
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a student is asked to transfer 0.03 ml of a concentrated solution in order to accurately dilute the solution to 0.020 m. which measuring tool would you choose to obtain the needed volume of the original concentrated solution?
To accurately measure a very small volume of liquid like 0.03 ml, a micropipette would be the most appropriate measuring tool to use.
What is micropipette?A micropipette is a laboratory instrument commonly used in biology, chemistry, and other related fields to accurately and precisely measure and transfer small volumes of liquids. It typically operates through a piston-driven air displacement system, allowing for very precise measurements in the microliter (μL) or even nanoliter (nL) range.
Micropipettes are commonly used in applications such as DNA sequencing, PCR, and protein assays, where precise and accurate liquid handling is essential for accurate results.
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A truck tire is filled with 1. 85 moles of gas at a pressure of 2. 1 atm and a temperature of 300 K. What is the volume of the gas in the tire?
The volume of the gas in the truck tire is approximately 44.2 L.
The ideal gas law equation can be used to solve for the volume of the gas in the tire:
PV = nRT
where P is the pressure of the gas, V is the volume of the gas, n is the number of moles of gas, R is the ideal gas constant, and T is the temperature of the gas.
Substituting the given values into the equation, we get:
(2.1 atm)(V) = (1.85 mol)(0.08206 L atm/mol K)(300 K)
Solving for V, we get:
V = (1.85 mol)(0.08206 L atm/mol K)(300 K)/(2.1 atm) ≈ 44.2 L
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An aqueous solution of sodium acetate, nach3coo, is made by dissolving 13.8 grams of sodium acetate in sufficient water in a 300. ml volumetric flask, and then adding enough water to fill the flask to the mark. what is the weight/volume percentage of sodium acetate in the solution?
The weight/volume percentage of sodium acetate in the solution is 4.6%.
The weight/volume percentage of sodium acetate in the solution can be calculated using the formula:
Weight/volume percentage = (Weight of solute ÷ Volume of solution) x 100%
In this case, the weight of sodium acetate is 13.8 grams and the volume of solution is 300 ml.
Therefore,
Weight/volume percentage = (13.8 g ÷ 300 ml) x 100%
Weight/volume percentage = 0.046 x 100%
Weight/volume percentage = 4.6%
Therefore, the weight/volume percentage of sodium acetate in the solution is 4.6%.
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A student places a metal sphere with a temperature of 98 degress Celsius into a container of water with a temperature of 50 degress Celsius. Which of these is most likely the temperature of the water after the sphere and the water have reached thermal equilibium?
40 degree Celsius
50 degrees Celsius
70 degrees Celsius
100 degrees Celsius
The most likely temperature of the water after the sphere and the water has reached thermal equilibrium is approximately 70 degrees Celsius. So option C is correct.
This is because heat energy will flow from the metal sphere to the water until they both reach the same temperature. The initial temperature difference between the metal sphere and the water will cause heat to flow from the sphere to the water. As the heat flows, the metal sphere will cool down and the water will heat up. Eventually, they will both reach the same temperature, which will be somewhere between the initial temperatures of the sphere and the water. Therefore option: c is Correct.
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What is the concentration of a solution that contains 25. 0 g NaOH in 500 cm3
of water?
The concentration of the solution containing 25.0 g NaOH in 500 cm³ of water is approximately 1.25 M (moles per liter).
To find the concentration of a solution containing 25.0 g NaOH in 500 cm³ of water, follow these steps:
1. Convert grams of NaOH to moles. The molar mass of NaOH is approximately 40 g/mol (Na = 23 g/mol, O = 16 g/mol, H = 1 g/mol).
25.0 g NaOH × (1 mol NaOH / 40 g NaOH) ≈ 0.625 mol NaOH
2. Convert the volume of water from cm³ to liters (L).
500 cm³ × (1 L / 1000 cm³) = 0.5 L
3. Calculate the concentration of the solution in moles per liter (M).
Concentration = moles of solute/volume of solvent (in liters)
Concentration = 0.625 mol NaOH / 0.5 L ≈ 1.25 M
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Identify the molecular geometry around each carbon atom in ch2chch3 using vsepr theory.
The molecular geometry around each carbon atom in [tex]CH_2CHCH_3[\tex]
using vsepr theory is tetrahedral and trigonal planar.
What is molecular geometry?
The three-dimensional shape that a molecule takes up in space is known as molecular geometry. It depends on the surrounding atoms and electron pairs as well as the core atom.
By assessing the amount of electron pairs surrounding an atom, the Valence Shell Electron Pair Repulsion (VSEPR) theory predicts molecular shapes and bond angles. Electron couples will reject one another because they are negatively charged. According to the idea, electron pairs will position themselves in three dimensions to minimise repulsion.
VSEPR Guidelines
Determine the main atom.
tally the valence electrons in it.
For every atom with a bond, add one electron.
For charge, add or subtract electrons (see Top Tip).
To determine the total, divide them by 2.
the quantity of electron pairs.
Make a shape prediction using this number.
Molecular geometry around propane is tetrahedral and trigonal planar.
Therefore, molecular geometry around [tex]CH_2CHCH_3[\tex] is tetrahedral and trigonal planar.
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A Gas Thermometer Measures Temperature By Measuring The Pressure Of A Gas Inside The Fixed Volume Container. A Thermometer Reads A Pressure Of 780 mmHg at 0C. What Is The Temperature When The Thermometer Reads A Pressure Of 800 mmHg?
The temperature when the thermometer reads a pressure of 800 mmHg is approximately 282.2 K (or 9.1 °C).
To solve this problem, we can use the ideal gas law:
PV = nRT
We can use this equation to calculate the temperature of the gas when the pressure is 800 mmHg.
First, we need to convert the pressures from mmHg to atm, since R is in units of L·atm/K·mol.
1 atm = 760 mmHg
780 mmHg = 1.026 atm
800 mmHg = 1.053 atm
Next, we can set up a ratio of the two pressures and temperatures:
P1/T1 = P2/T2
[tex](1.026 atm) / (273.15 K) = (1.053 atm) / T2[/tex]
Solving for T2, we get:
[tex]T2 = (1.053 atm) / (1.026 atm/273.15 K) \\T2 = 282.2 K[/tex]
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If the molal concentration in water is the same for the following substances, rank these solutions in decreasing melting point. Highest placed in the rank will have the highest melting point.
calcium phosphate, Ca3(PO4)2
glucose, c6h12o6
sodium chloride, NaCl
magnesium chloride, MgCl2
The ranking of these solutions in decreasing melting point is: calcium phosphate > magnesium chloride > sodium chloride > glucose.
To rank the solutions with the same molal concentration in decreasing order of their melting points, we need to consider their van't Hoff factor (i), which represents the number of particles a solute dissociates into when dissolved in water. The formula to calculate the effect of a solute on the melting point of a solution is ΔTf = Kf × m × i, where Kf is the cryoscopic constant of water, m is the molality, and i is the van't Hoff factor.
Here are the van't Hoff factors for each substance:
1. Calcium phosphate, Ca₃(PO₄)₂: This substance dissociates into 5 ions (3 Ca²⁺ + 2 PO₄³⁻), so i = 5.
2. Glucose, C₆H₁₂O₆: This substance is a molecular compound and does not dissociate into ions, so i = 1.
3. Sodium chloride, NaCl: This substance dissociates into 2 ions (Na⁺ + Cl⁻), so i = 2.
4. Magnesium chloride, MgCl₂: This substance dissociates into 3 ions (Mg²⁺ + 2 Cl⁻), so i = 3.
Using the van't Hoff factor, we can rank the solutions in decreasing order of their melting points:
1. Calcium phosphate, Ca₃(PO₄)₂ (i = 5)
2. Magnesium chloride, MgCl₂(i = 3)
3. Sodium chloride, NaCl (i = 2)
4. Glucose, C₆H₁₂O₆ (i = 1)
So, the ranking of these solutions in decreasing melting point is: calcium phosphate > magnesium chloride > sodium chloride > glucose.
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If a 2000g block of metal lost 3120 j of heat energy is cooled from 212 c to 200 c, what is the specific heat of the metal
Explanation:
3120 j / (2000 g * (212-200 C) ) = .13 j /( g C)
Help what’s the answer?
The computation in the question results in the production of 21 g of NF3.
The limiting reactant determines the product in what way?Because it is the reactant that is totally consumed during the reaction, the limiting reactant specifies the maximum amount of product that can be created in a chemical process.
F2 molecular weight is 16.5 g/38 g/mol.
= 0.43 moles
N2 molecular weight is 16.5 g/28 g/mol.
= 0.59 moles
Now;
If 3 moles of F2 and 1 mole of N2 react,
N2 interacts with 0.59 moles at 0.59 * 3/1.
= 1.77 moles of F2
Thus F2 is the limiting reactant
2 moles of NF3 are created from 3 moles of F2.
When using 0.43 moles of F2, you get 0.43 * 2/3.
= 0.29 moles
NF3 mass generated is 0.29 moles * 71 g/mol.
= 21 g
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A balloon containing 2. 6 mol hydrogen has a volume of 3. 9 l. More hydrogen is added to the balloon, giving it a volume of 17. 1 l. How many moles of hydrogen were added? show your work
The moles of hydrogen added to the balloon to give it a volume of 17.1 L were 8.8 mol.
Determine the initial ratio of moles to volume:
Initial moles of hydrogen = 2.6 mol
Initial volume of the balloon (V₁) = 3.9 L
Ratio of moles to volume: 2.6 mol / 3.9 L = 0.6667 mol/L
Final volume of the balloon (V₂) = 17.1 L
Calculate the final moles of hydrogen in the balloon using the initial ratio of moles to volume.
Final moles of hydrogen (H₂) = Ratio of moles to volume * V₂
Final moles of hydrogen (H₂) = 0.6667 mol/L * 17.1 L = 11.4 mol
The number of moles of hydrogen added thus are:
Moles of hydrogen added = Final moles of hydrogen - Initial moles of hydrogen
Moles of hydrogen added = 11.4 mol - 2.6 mol = 8.8 mol
So, 8.8 moles of hydrogen were added to the balloon to give it a volume of 17.1 L.
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you need to make an aqueous solution of 0.172 m iron(ii) nitrate for an experiment in lab, using a 250 ml volumetric flask. how much solid iron(ii) nitrate should you add?
We need to add 7.7 g of solid iron(II) nitrate to make a 0.172 M solution in 250 mL volumetric flask.
First, we can use molarity and volume of solution to find the number of moles of iron(II) nitrate needed:
moles of [tex]Fe(NO_3)_2[/tex]= Molarity × Volume in liters
moles of [tex]Fe(NO_3)_2[/tex] = 0.172 mol/L × 0.250 L = 0.043 mol
Next, we can use the molar mass of iron(II) nitrate to find the mass of the solid that needs to be added:
mass of [tex]Fe(NO_3)_2[/tex] = moles of [tex]Fe(NO_3)_2[/tex] × molar mass of [tex]Fe(NO_3)_2[/tex]
mass of [tex]Fe(NO_3)_2[/tex]= 0.043 mol × (55.85 g/mol + 2 × 14.01 g/mol + 6 × 16.00 g/mol)
mass of [tex]Fe(NO_3)_2[/tex]= 0.043 mol × 179.86 g/mol = 7.7 g
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What is the mass of a sample of NH3 containing 3. 80 × 10^24 molecules of NH3?
Answer:
107g
Explanation:
First convert the number of molecules to moles using avogadro's number.
There are 6.02 x 10^23 molecules in 1 mol.
3.8 x 10^24 molecules NH3 ÷ 6.02 x 10^23 molecules / mol
= 6.31 mol NH3
Now that we have moles of NH3 we can multiply it by NH3's molecular mass.
NH3 molecular mass = Mass of N + Mass of H x 3
14.007g/mol + 1.008g/mol * 3
= 17.031 g NH3/ mol
6.31 mol NH3 * 17.031 g NH3 / mol
= 107g NH3
What mass of solid CH2Cl2 can be melted by applying 7. 80 kJ of energy at the melting point?
grams (3 sig figs)
The mass of CH2Cl2 that can be melted by applying 7.80 kJ of energy at the melting point can be calculated using the equation of q = m * c * ΔT, where q is the energy applied, m is the mass, c is the heat capacity, and ΔT is the difference between the final and initial temperatures. In this case, the mass can be calculated as m = q / (c * ΔT). Plugging in the given values yields a mass of 0.126 g, rounded to three significant figures.
Therefore, 7.80 kJ of energy can melt 0.126 g of solid CH2Cl2 at the melting point. The equation used for this calculation assumes that the heat capacity and melting point of CH2Cl2 remain constant throughout the process, and thus the calculated value is only an estimate.
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There is a transfer of chemical energy from producers to consumers. What is this chemical energy?.
The chemical energy referred to in the transfer from producers to consumers is the energy stored in the organic molecules synthesized by the producers during photosynthesis.
Producers, such as plants and algae, use energy from sunlight to convert carbon dioxide and water into glucose and other organic molecules through the process of photosynthesis. The energy from the sunlight is converted into chemical energy and stored in the organic molecules.
Consumers, such as herbivores and carnivores, obtain this stored chemical energy by consuming the organic molecules synthesized by the producers. The organic molecules are broken down during cellular respiration to release the stored chemical energy, which is used by the consumer to power its cellular processes.
Thus, the transfer of chemical energy from producers to consumers is a fundamental process in the food chain, and it is essential for the maintenance of life on earth.
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What is the ph of a solution that has a poh of 9.1
The pH of the solution is 4.9.
The pH and pOH of a solution are related by the equation:
pH + pOH = 14
Therefore, if the pOH of a solution is 9.1, we can calculate its pH as:
pH = 14 - pOH
pH = 14 - 9.1
pH = 4.9
So, the pH of the solution is 4.9. The pH scale is a logarithmic scale that measures the acidity or basicity of a solution. A pH of 7 is neutral, while a pH below 7 is acidic and a pH above 7 is basic. In this case, the pH is below 7, which means the solution is acidic.
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calculate the molality of a solition with 85 g of KOH added to 590. g of water
It is the basic element of drawing that helps us illustrate the realistic view of an object *
line
alphabet of lines
drawing
lay-out
The basic element of drawing that helps us illustrate the realistic view of an object is the "line."
Lines are essential as they define shapes, outlines, and edges of objects in drawings. The "alphabet of lines" refers to the different types of lines used in technical drawing, such as continuous, dashed, and dotted lines.
These lines help convey various details and aspects of the object being drawn.
In the "drawing" process, you use these lines to create a realistic representation of an object by capturing its dimensions, proportions, and perspective.
The "layout" is the arrangement of these lines and shapes on the drawing surface, ensuring a clear and organized presentation. To "generate" a drawing, you must effectively utilize these lines, the alphabet of lines, and the layout to create a visually accurate representation of the object you are depicting.
By incorporating these terms and concepts, you can create a detailed and realistic drawing that effectively communicates the appearance and characteristics of the object in question.
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What mass in grams of hydrogen gas is produced if 20. 0 mol of zn are added to excess hydrochloric acid according to the equation
zn(s) +2hcl(aq) --> zncl₂(aq) + h₂(g)?
First, we need to use stoichiometry to find out how many moles of hydrogen gas are produced. From the balanced chemical equation, we can see that for every 1 mole of zinc (Zn), 1 mole of hydrogen gas (H2) is produced. Therefore, if we have 20.0 mol of Zn, we will also produce 20.0 mol of H2.
Next, we can use the formula for the mass of a gas:
mass = molar mass x number of moles
The molar mass of hydrogen gas is approximately 2.02 g/mol. Therefore, the mass of 20.0 mol of hydrogen gas would be:
mass = 2.02 g/mol x 20.0 mol
mass = 40.4 g
So, 40.4 grams of hydrogen gas are produced when 20.0 mol of Zn are added to excess hydrochloric acid.
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