Answer:
The problem provides you with the solubility of potassium chloride,
KCl
, in water at
20
∘
C
, which is said to be equal to
34 g / 100 g H
2
O
.
This means that at
20
∘
C
, a saturated solution of potassium chloride will contain
34 g
of dissolved salt for every
100 g
of water.
As you know, a saturated solution is a solution that holds the maximum amount of dissolved salt. Adding more solid to a saturated solution will cause the solid to remain undissolved.
In your case, you can create a saturated solution of potassium chloride by dissolving
34 g
of salt in
100 g
of water at
20
∘
C
.
Now, your goal here is to figure out how much potassium chloride can be dissolved in
300 g
of water at this temperature. To do that, use the given solubility as a conversion factor to take you from grams of salt to grams of water
different between Anzeotropic mixture and Anzeotropic temperature
Answer:
An azeotropic compound is a mixture of two substances which distil at the same temperature. An azeotrope is a mixture of compounds with the same composition in the vapour as in the liquid.
Explanation:
Hope it helps!
In the "heavy
water" that is used in nuclear reactors,
the hydrogen in water is replaced with
deuterium. Deuterium is a hydrogen
atom with a neutron. It has a molar
mass twice that of hydrogen. Sketch
the percent composition pie chart for
heavy water.
Heavy water contains 20% hydrogen by mass and 80% oxygen by mass.
What is the molar mass of heavy water?Heavy water is water which contains the heavy isotope of hydrogen, Hydrogen-2 in its molecules.
The mass of heavy water is greater than that of water.
The molar mass of heavy water is 20.0 g
The percentage composition of the elements in heavy water are as follows:
Hydrogen = 2 × 2g/20 g ×100% = 20%
Oxygen = 16g/20g × 100% = 80%.
Therefore, Heavy water contains 20% hydrogen by mass and 80% oxygen by mass.
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AP CHEM answer and i will give brainliest, image attached
Answer:
what is this i dont know what kind of math this is
What is the molar concentration (molarity, M) of a 450 mL solution that contains 2.00 mol of FeCl₂?
Answer:
3.50 Mol/L or M
Explanation:
450 mL / 1000 = 0.45 L
1 mole ------- 126.751 g
? mole ------- 200 g
moles = 200 * 1 / 126.751
moles = 200 / 126.751
= 1.57789 moles FeCl₂
M = n / V
M = 1.57789 / 0.45
= 3.50 Mol/L or M
The compound M3X3 has a solubility of 0.039 g/L and a molar mass, ℳ = 108.64 g/mol. Calculate the Ksp for this compound.
Report your answer to TWO significant figures. You may (but are not required to) enter your answer in scientific notation; for example, if your answer is 2.4 × 10−2, you would enter 2.4E-2. The E must be uppercase.
Let's see
[tex]\\ \rm\Rrightarrow [M_3X_3]\leftrightharpoons {[M^{3+}]\atop 3x}+{[X^{3-}]\atop 3x}[/tex]
So
As solubility and molar mass given
[tex]\\ \rm\Rrightarrow [M_3X_3]=\dfrac{Solubility}{Molar\:mass}[/tex]
[tex]\\ \rm\Rrightarrow x=\dfrac{0.039}{108.64}[/tex]
[tex]\\ \rm\Rrightarrow x=0.00034M=3.4\times 10^{-4}M[/tex]
So
[tex]\\ \rm\Rrightarrow K_{sp}=(3x)(3x)=(3x)^2=9x²[/tex]
So
[tex]\\ \rm\Rrightarrow K_{sp}=9(3.4\times 10^{-4})^2=0.0000010404=104\times 10^{-6}mol^2L^{-2}=104\mu mol^2L^{-2}[/tex]
How would describe the characteristics of the urine
Urine has the color of pale yellow to deep amber. It is odorless and has a pH of 4.5-8.0
Which is a characteristic of an aqueous solution of HNO3?
A.
It conducts electricity.
B.
It forms OH-ions.
C.
It turns litmus blue.
D.
It turns phenolphthalein pink.
Answer:
A. it conducts electricity
Explanation:
A. Since Nitric Acid is a strong acid, which means it is a strong oxidizing agent, this makes Nitric Acid a good conductor of electricity.
B. Basic solutions are only going to form OH⁻ ions. A Nitric Acid solution will form H⁺ ions.
C. Alkaline substances (pH greater than 7) are more likely to turn blue, so HNO₃ would turn that blue into a red color.
D. I don't know much about phenolphthalein , all I know is that is is pink in Alkaline solutions (basic) and colorless in acidic solutions.
I hope this helps, good luck!
our energy supply is running out
The statement that our energy supply is running out is false in accordance with the law of conservation of energy.
What is the law of conservation of energy?The law of conservation of energy states that the energy possessed by an object or physical body can neither be created nor destroyed, but it can only be transformed from one form of energy to another.
This ultimately implies that, we cannot run out of energy supply because the energy we generate from any source can't be destroyed in accordance with the law of conservation of energy.
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The heat of vaporization is 540 calories per gram. What is the minimum number of
calories needed to change 40.0 grams of water
at 100°C to steam at the same temperature and
pressure?
The minimum number of calories needed to change 40 g of water at 100°C to steam is 21600 calories
Data obtained from the question Mass of water (m) = 40 gHeat of fusion (ΔHv) = 540 cal/gHeat (Q) =?The heat needed to vaporise the water at 100 °C can be obtained as follow:
Q = m × ΔHv
Q = 40 × 540
Q = 21600 calories
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Please help with my Chem101 hw
hydrogen chloride(hydrogen, and chlorine
A square is used to represent the structure of which compound?
butane, 2,3-dimethyl butane, cyclobutane, cyclopentane
Answer:
cyclobutane
Explanation:
Label the figure below with the names of a volcano's parts.
Answer:
Hello the answer for the volcanos is here below:
7. Pipe
8. Crater
9. Vent
10. lava flow
11. magma chamber
Hope this helps :)
Why is there an imbalance in the carbon cycle?
Which of these describes an ethical dilemma associated with prosthetics?
OA. The use of prosthetics to enable someone who has lost a bodily
function to regain that function
OB. The surgery required to maintain or replace prostheses
OC. The future use of prosthetics to enhance a body part's natural
function
D. Using a prosthetic arm that connects with nerve endings to receive
messages from the brain
Answer:
OC
Explanation:
Is the only answer which implies a dilemma.
An ethical dilemma associated with prosthetics among the following is The future use of prosthetics to enhance a body part's natural function. Hence, Option (C) is correct
What is Prosthetics ?
In medicine, a prosthesis, or a prosthetic implant, is an artificial device that replaces a missing body part, which may be lost through trauma, disease, or a condition present at birth.
Prostheses are intended to restore the normal functions of the missing body part.
Therefore, An ethical dilemma associated with prosthetics among the following is The future use of prosthetics to enhance a body part's natural function. Hence, Option (C) is correct
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Given the reaction, how many moles of Z will be produced from 4.85 mol A, assuming excess B?
2 A +3B = 4Y + 5 Z
Answer:
12.125 moles of Z
Explanation:
Hi! Here, since you only know the number of moles for one of the reactants, you will use the coefficients in the reaction to use the mole ratio to find your answer. Since the question states that there are 4.85 mol A and excess B, A is your limiting reactant. This means that once all of the A is used up in the reaction, you will have your maximum amount of Z left behind because there will only be B left and no A to make more Z.
The mole ratio of A:Z is 2:5, found from the coefficients in the chemical equation(2 moles of A for every 5 moles of Z).
So, start with the information that is given to you (4.85 mol A) and then use the mole ratio, like this:
4.85 mol A([tex]\frac{5 mol Z}{2 mol A}[/tex])
This way, the mol A will cancel out, leaving behind mol Z (always put the unit you are looking for on top).
Doing this leads to mol Z = 12.125 mol.
I hope this helps! Good luck with your finals!
As per the given 4.85 moles of A will produce 12.125 moles of Z, assuming excess B.
What is chemical reaction?A chemical reaction is the transformation of one or more substances, known as reactants, into one or more different substances, known as products.
Chemical reactions involve the breaking and forming of chemical bonds between atoms and molecules, causing atoms to rearrange and the chemical and physical properties of the substances involved to change.
From the balanced chemical equation, we can see that 2 moles of A react with 3 moles of B to produce 5 moles of Z.
So the mole ratio of A to Z is 2:5.
Therefore, if 2 moles of A react to produce 5 moles of Z, then 4.85 moles of A will produce:
(4.85 mol A) x (5 mol Z / 2 mol A) = 12.125 mol Z
Thus, 4.85 moles of A will produce 12.125 moles of Z, assuming excess B.
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What is an example of equilibrium?
O the release of a gas product from an open system
O the partial dissolution of salt crystals in saturated water
O the combustion of gasoline in a car engine
O the mixing of oil and water in a closed container
A good example of equilibrium would be the mixing of oil and water in a closed container.
What is chemical equilibrium?Chemical equilibrium is a condition in which the concentrations of components of a chemical reaction remain unchanged and have no tendency to change.
Of all the options, the only one where the concentrations of the component reactants cannot change is a mixture containing oil and water in a closed container.
Oil and water are immiscible and thus, their concentrations remain constant.
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What’s the answer???????#15
Answer:
C.They are only magnetic if an electric current is running through them
Explanation:
Electromagnets are conductors which develop a magnetic field due to the electrons flowing through them. If the flow of electric current stops, the motion of the electrons stop and they do not generate their magnetic fields.
Matter is made of atoms that have positive centers of neutrons and protons
surrounded by a cloud of negatively charged electrons.
This statement is...
Question 2 of 30
A pamphlet about a fuel that contains up to 15% ethanol claims that the fuel
produces less of some types of pollution. The amount of ethanol in the fuel
and the pollutants are regulated by the government. What can you not infer
from this information?
Answer:
the awnser is d the other fuel produce more pollutants
Explanation:
because right out the bat we know that other fuels produce more than a 15 percent fuel so the right awnser is d
Question in pic please see questions below !!!
Answer:
its the same thing as 3 x3 or 3+3 it always come´s back as 9 or 6 Because of life
Explanation:
Stronger acids are different than weaker acids because they are more likely to
Answer:
Strong acids completely ionize while weak acids partially ionize
If liquid nitrogen is poured over a balloon, what will happen to the volume of the balloon? Use
the kinetic-molecular theory to explain
Answer:
The balloon will instanly freeze and "shatter" :)
Explanation:
The volume of a gas will shrink if its temperature decreases. The cold liquid nitrogen cools the air inside the balloon. As a result the molecules of air slow down causing the volume of the balloon to decrease. :)
Have an amazing day!!
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A constant current of 0.350 A is passed through an electrolytic cell containing molten CrCl₂ for 21.7 h. What mass of Cr(s) is produced? The molar mass of chromium is 52.0 g/mol. Provide your answer rounded to 3 significant digits.
An electrochemical cell can generate or use electrical energy. The mass of solid chromium that will be deposited on the electrochemical plate is 7.17 gm.
What is current?Current in an electrochemical cell is the ratio of the quantity of electricity in columns and time in seconds.
Given,
Current (I) = 0.350 A
Time = 21.7 hours
Molar mass of chromium = 52.0 g/mol
First time is converted into seconds:
1 hour = 3600 seconds
21.7 hours = 76020 seconds
The quantity of electricity flowing in the electrochemical solution is calculated as:
[tex]\begin{aligned} \rm Q & = \rm It\\\\& = 0.350 \times 76020 \\\\& = 26607\;\rm C \end{aligned}[/tex]
Electricity required for depositing 1 mole or 52.0 g chromium is calculated as:
In electrochemical solution, chromium chloride is dissociated as:
[tex]\rm CrCl_{2} \rightarrow Cr^{2+} + 2 Cl^{-} \\\\\rm Cr^{2+} +2 e^{-} \rightarrow Cr[/tex]
Two moles of electrons are needed to deposit 52.0 g of chromium.
If, 1 electron = 96500 C
Then, 2 electron = 193000 C
The mass of chromium deposited is calculated as:
193000 C = 52 g chromium
So, 26607 C = [tex]\dfrac{26607 \times 52}{193000} = 7.17 \;\rm gm[/tex]
Therefore, 7.17 gm of chromium is produced.
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Which type of galaxy is shown
Answer:
Spriral
Explanation:
hope this helps
The molar solubility of CoS is 5.0 × 10-22 mol L–1 in pure water. Calculate the Ksp for CoS.
Answer:
2.5 X 10^-43
Explanation:
CoS> Co + S
Co=X
S=X
X= 5.0 X 10^-22
Ksp= [X][X]
Ksp= [5.0 X 10^-22][5.0 X 10^-22]
Ksp= 2.5 X 10^-43
The Ksp for CoS is calculated as 2.5 × 10⁻⁶³ (mol/L)². This value represents the equilibrium constant for the dissociation of CoS in water and indicates the extent of its solubility in the solution.
The molar solubility of CoS is given as 5.0 × 10⁻²² mol/L. In the chemical equation for the dissolution of CoS in water, it dissociates into Co⁻²⁺ and S²⁻ ions.
The solubility product constant (Ksp) expression for CoS is written as:
Ksp = [Co²⁺] * [S²⁻]
Since CoS dissolves completely to form one Co²⁺ ion and one S²⁻ ion, we substitute the molar solubility values into the Ksp expression:
Ksp = (5.0 × 10⁻²² mol/L) * (5.0 × 10⁻²² mol/L)
Ksp = 2.5 × 10⁻⁴³ (mol/L)²
Therefore, the Ksp for CoS is calculated as 2.5 × 10⁻⁶³ (mol/L)². CoS has an extremely low solubility in water, resulting in an exceptionally small Ksp value.
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Under what conditions would pressure affect the reaction rate
Answer: D) If the reaction occurs in the gas phase
Explanation:
Balance the following chemical reaction equation:
FeS + _02_Fe2O3 + ___SO2
Explanation:
the answer is in the image above
Calculate the free energy change for the hydrolysis of ATP under these conditions.
The standard free energy change for the hydrolysis of ATP is -46.5 kJ.
ATP(aq)+H2O(l)→ADP(aq)+Pi(aq)
The concentrations of ATP, ADP, and Pi are 0.0089 M, 0.0019 M, and 0.0038 M. (Assume a temperature of 298 K.)
The free energy change for the hydrolysis of ATP by using the equation ATP(aq)+H2O(l)→ADP(aq)+Pi(aq) is -64362.77joules.
How do we calculate free energy change of reaction?We can calculate the free energy change of reaction by using the standard free energy by using the below link:
ΔG = ΔG⁰ + RTlnQ, where
R = ideal gas constant = 8.314 J/mol.K
ΔG⁰ = standard free energy = -46.5 kJ = -46500 J
T = temperature = 298 K
Q = ratio of the products to reactants for the given chemical reaction
Q = [0.0019][0.0038] / [0.0089] = 8.1×10⁻⁴
On putting values on the above equation, we get
ΔG = -46500 + (8.314)(298)ln(8.1×10⁻⁴)
ΔG = -46500 + (2477.5)(-7.21)
ΔG = -46500 - 17862.77
ΔG = -64362.77
Hence required value of free energy change is -64362.77 joules.
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The Second Law of Thermodynamics states that:
Select one:
Answer:
In the total entropy of an isolated system, the thermal energy per unit temperature that is unavailable for doing useful work can never decrease.
Check that Alpha Decay and Uranium are selected. Turn on Write Equation and Show Equation. What you see is an equation that shows the original uranium atom on the left. The boxes on the right represent the daughter product- the atom produced by radioactive decay- and the emitted alpha particle.
A. The upper left number next to the daughter product is the mass number of the daughter product. What is the mass number of the daughter product ?
B. The lower left number next to the daughter product is the atomic number of the daughter product. What is the atomic number of the daughter product ?
C. According to your equation, what isotope remains after the alpha decay of uranium-238?(Hint: look up the element symbol on the periodic table and name the element then dash and then mass number from A- ex: uranium-238)
D. How does the mass number of the daughter product after alpha decay relate to the original atom?
E. How does the atomic number of the daughter product after alpha decay relate to the original atom?
(A) The mass number of the daughter product is 234.
(B) The atomic number of daughter product is 90.
(C) The isotope that remains after the alpha decay is thorium-234.
(D) The mass number of the daughter product is 4 less than the original atom.
(E) The atomic number of the daughter product is 2 less than the original atom.
Alpha decay of UraniumThe alpha decay of Uranium involves the emission of alhpa particles and thorium-234 as daughter product.
[tex]^{238}_{92}U\ ---- > \ \ ^4_2He \ + \ ^{234}_{90}Th[/tex]
From the equation of alpha decay of Uranium, we can infer the following;
The mass number of the daughter product is 234.The atomic number of daughter product is 90.The isotope that remains after the alpha decay is thorium-234.The mass number of the daughter product is 4 less than the original atom.The atomic number of the daughter product is 2 less than the original atom.Learn more about alpha decay here: https://brainly.com/question/17145324
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