Question 1

A solution is 35.0% by mass carbon tetrachloride (CCl4)  in benzene (C6H6)  at 20 ∘\circ∘ C. The vapor pressure of pure benzene and pure carbon tetrachloride at this temperature is 74.61 mmHg and 91.32 mmHg, respectively. Calculate the vapor pressure of the solution at 20 ∘\circ∘ C:

Accepted Answer

A)   58.1 mmHg
B)   78.2 mmHg
C)   80.5 mmHg
D)   82.9 mmHg
E)   83.0 mmHg F) B) and E)
G) C) and D)

Question 2

Calculate the molality of a 15.0% by mass solution of MgCl2 in H2O. The density of this solution is 1.127 g/mL.

Accepted Answer

A)   0.0134 m
B)   0.157 m
C)   1.58 m
D)   1.86 m
E)   11.8 mF) C) and D)
G) B) and E)

Question 3

What is the osmotic pressure of a solution prepared from 13.7 g of the electrolyte HCl and enough water to make 0.500 L of solution at 18 ∘\circ∘ C

Accepted Answer

A)   0.55 atm
B)   1.10 atm
C)   8.95 atm
D)   17.9 atm
E)   35.9 atm F) D) and E)
G) B) and E)

Question 4

What is the molarity and molality of a solution that is 10.00 % by mass potassium hydrogen carbonate (KHCO3, 100.11 g/mol)  and has a density of 1.0650 g/mL

Accepted Answer

A)   1.064 M and 1.410 m
B)   1.044 M and 1.410 m
C)   1.064 M and 1.110 m
D)   1.044 M and 1.110 m
E)   None of the aboveF) B) and E)
G) B) and D)

Question 5

A solution is prepared by adding 40.3 g of Mg(NO3) 2 to 127 g of water. Calculate the mole fraction and molality of magnesium nitrate in this solution.

Accepted Answer

A)   Mole fraction = 0.0371; molality = 2.14 m
B)   Mole fraction = 0.0571; molality = 2.14 m
C)   Mole fraction = 0.0371; molality = 1.14 m
D)   Mole fraction = 0.0571; molality = 1.14 m
E)   None of the aboveF) B) and D)
G) B) and E)

Question 6

The density of a 20.3 M CH3OH (methanol)  solution is 0.858 g/mL. What is the molality of this solution H2O is the solvent.

Accepted Answer

A)   17.4 m
B)   20.8 m
C)   23.7 m
D)   70.0 m
E)   97.6 mF) B) and E)
G) A) and B)

Question 7

What is the concentration of O2(g)  in water at 25 ∘\circ∘ C exposed to a partial pressure of oxygen of 325 mmHg The Henry's law constant for oxygen gas at 25 ∘\circ∘ C is 1.3 * 10-3 mol/L·atm.

Accepted Answer

A)   1.6 * 10-4 M
B)   3.6 * 10-4 M
C)   5.6 * 10-4 M
D)   7.6 * 10-4 M
E)   None of the above F) C) and E)
G) B) and C)

Question 8

0.102 g of an unknown compound dissolved in 100. mL of water has an osmotic pressure of 28.1 mmHg at 20 ∘\circ∘ C. Calculate the molar mass of the compound.

Accepted Answer

A)   727 g/mol
B)   663 g/mol
C)   1.10 * 102 g/mol
D)   1.15 g/mol
E)   0.872 g/mol F) A) and D)
G) A) and C)

Question 9

Calculate the molality of 6.0 M H2SO4 solution. The density of the solution is 1.34 g/mL.

Accepted Answer

A)   4.48 m
B)   7.98 m
C)   8.10 m
D)   8.43 m
E)   10.2 mF) D) and E)
G) C) and D)

Question 10

Determine the mass percent HCl in a 1.2 M solution of hydrochloric acid with a density of 1.019 g/mL.

Accepted Answer

A)   3.0 %
B)   4.3 %
C)   8.6 %
D)   13%
E)   30. %F) A) and E)
G) All of the above

Question 11

The solubility of oxygen in lakes high in the Rocky Mountains is affected by the altitude. If the solubility of O2 from the air is 2.67 * 10-4 M at sea level and 25 ∘\circ∘ C, what is the solubility of O2 at an elevation of 12,000 ft where the atmospheric pressure is 0.657 atm Assume the temperature is 25 ∘\circ∘ C, and that the mole fraction of O2 in air is 0.209 at both 12,000 ft and at sea level.

Accepted Answer

A)   3.66 * 10-5 M
B)   1.75 * 10-4 M
C)   2.67 * 10-4 M
D)   4.06 * 10-4 M
E)   None of the above. F) A) and B)
G) A) and C)

Question 12

The heat of solution

Accepted Answer

A) is never positive (ΔHsoln∘≤0) (\Delta{H}^{\circ}_{soln} \leq 0) (ΔHsoln∘≤0) , because the solute-solvent attraction is never weaker than the combination of the solute-solute attraction and solvent-solvent attraction. B) is always positive 0) ">(ΔHsoln∘>0) (\Delta{H}^{\circ}_{soln} > 0) (ΔHsoln∘>0) , because the solute-solvent attraction is always weaker than the combination of the solute-solute attraction and solvent-solvent attraction. C) is always zero ( Δ\DeltaΔ H ∘\circ∘ soln = 0) , because the solute-solvent attraction is defined as the average of the solute-solute attraction and solvent-solvent attraction. D) is always negative (ΔHsoln∘<0) (\Delta{H}^{\circ}_{soln} < 0) (ΔHsoln∘<0) , because the solute-solvent attraction is always stronger than the combination of the solute-solute attraction and solvent-solvent attraction. E) may be positive, zero, or negative, depending on the relative strength of the solute-solvent, solute-solute, and solvent-solvent attractive forces. F) A) and C) G) C) and E)

Question 13

Using your knowledge of osmosis or osmotic pressure decide if the following statement is true or false:
-When sprinkled with sugar, a dish of sliced fruit will form its own juice.

Accepted Answer

A) True 
 B)False

Question 14

What is the freezing point of a solution that contains 10.0 g of glucose (C6H12O6)  in 100.g of H2O Kf for water is 1.86 ∘\circ∘ C/m.

Accepted Answer

A)   +0.10 ∘\circ∘ C
B)   +0.186 ∘\circ∘ C
C)   -0.10 ∘\circ∘ C
D)   -0.186 ∘\circ∘ C
E)   -1.03 ∘\circ∘ C F) None of the above
G) B) and E)

Question 15

Arrange the following aqueous solutions in order of increasing boiling points: 0.050m Mg(NO3) 2; 0.100m ethanol; 0.090m NaCl.

Accepted Answer

A)   Mg(NO3) 2 
B)   ethanol 3) 2 
C)   ethanol 3) 2
D)   NaCl 3) 2
E)   Mg(NO3) 2 < ethanol < NaClF) B) and E)
G) C) and E)

Question 16

A solution made of pentane and hexane has a mole fraction, X = 0.250 of pentane. Hexane is the solvent.

Accepted Answer

A) True 
 B)False

Question 17

Which of the following aqueous solutions has the largest molality of benzoic acid (C6H5COOH)

Accepted Answer

A)   3.5 m C6H5COOH
B)   mole fraction, X = 0.050 C6H5COOH
C)   2.50 mass % C6H5COOH
D)   3.2 g C6H5COOH in 650. g of H2O
E)   1.5 moles C6H5COOH in 65.0 moles of H2OF) A) and E)
G) B) and C)

Question 18

A solution that is 33.6 % by mass of phenol (C6H5OH)  in water is prepared. What is the mole fraction of the phenol

Accepted Answer

A)   0.0969
B)   0.0643
C)   0.0883
D)   0.0604
E)   0.357F) C) and D)
G) A) and E)

Question 19

The vapor pressure of water at 45.0  ∘\circ∘ C is 71.93 mmHg. Calculate the vapor pressure of a solution of 1.50m K2CO3 at this temperature (assume 100% dissociation) .

Accepted Answer

A)   1.89 mmHg
B)   5.39 mmHg
C)   66.5 mmHg
D)   70.0 mmHg
E)   108 mmHg F) A) and B)
G) A) and E)

Question 20

Calculate the approximate freezing point of a solution made from 21.0 g NaCl and 1.00 * 102 g of H2O. [Kf of water is 1.86 ∘\circ∘ C/m.]

Accepted Answer

A)   -13.4 ∘\circ∘ C
B)   -6.68 ∘\circ∘ C
C)   -3.59 ∘\circ∘ C
D)   3.59 ∘\circ∘ C
E)   6.68 ∘\circ∘ C F) B) and E)
G) None of the above

Exam 12: Physical Properties of Solutions

Calculate the molality of 6.0 M H₂SO₄ solution. The density of the solution is 1.34 g/mL.

Correct Answer
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0.102 g of an unknown compound dissolved in 100. mL of water has an osmotic pressure of 28.1 mmHg at 20^$\circ$C. Calculate the molar mass of the compound.

Correct Answer
verified

Calculate the molality of a 15.0% by mass solution of MgCl₂ in H₂O. The density of this solution is 1.127 g/mL.

Correct Answer
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A solution made of pentane and hexane has a mole fraction, X = 0.250 of pentane. Hexane is the solvent.

Correct Answer
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Correct Answer
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What is the concentration of O₂(g) in water at 25^$\circ$C exposed to a partial pressure of oxygen of 325 mmHg The Henry's law constant for oxygen gas at 25^$\circ$C is 1.3 * 10^-3 mol/L·atm.

Correct Answer
verified

The vapor pressure of water at 45.0 ^$\circ$C is 71.93 mmHg. Calculate the vapor pressure of a solution of 1.50m K₂CO₃ at this temperature (assume 100% dissociation) .

Correct Answer
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The density of a 20.3 M CH₃OH (methanol) solution is 0.858 g/mL. What is the molality of this solution H₂O is the solvent.

Correct Answer
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Using your knowledge of osmosis or osmotic pressure decide if the following statement is true or false: -When sprinkled with sugar, a dish of sliced fruit will form its own juice.

Correct Answer
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What is the freezing point of a solution that contains 10.0 g of glucose (C₆H₁₂O₆) in 100.g of H₂O K_f for water is 1.86^$\circ$C/m.

Correct Answer
verified

Determine the mass percent HCl in a 1.2 M solution of hydrochloric acid with a density of 1.019 g/mL.

Correct Answer
verified

A solution is prepared by adding 40.3 g of Mg(NO₃) ₂ to 127 g of water. Calculate the mole fraction and molality of magnesium nitrate in this solution.

Correct Answer
verified

Calculate the approximate freezing point of a solution made from 21.0 g NaCl and 1.00 * 10² g of H₂O. [K_f of water is 1.86^$\circ$C/m.]

Correct Answer
verified

Arrange the following aqueous solutions in order of increasing boiling points: 0.050m Mg(NO₃) ₂; 0.100m ethanol; 0.090m NaCl.

Correct Answer
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What is the osmotic pressure of a solution prepared from 13.7 g of the electrolyte HCl and enough water to make 0.500 L of solution at 18^$\circ$C

Correct Answer
verified

Which of the following aqueous solutions has the largest molality of benzoic acid (C₆H₅COOH)

Correct Answer
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What is the molarity and molality of a solution that is 10.00 % by mass potassium hydrogen carbonate (KHCO₃, 100.11 g/mol) and has a density of 1.0650 g/mL

Correct Answer
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A solution that is 33.6 % by mass of phenol (C₆H₅OH) in water is prepared. What is the mole fraction of the phenol

Correct Answer
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The heat of solution

Correct Answer
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A solution is 35.0% by mass carbon tetrachloride (CCl₄) in benzene (C₆H₆) at 20^$\circ$C. The vapor pressure of pure benzene and pure carbon tetrachloride at this temperature is 74.61 mmHg and 91.32 mmHg, respectively. Calculate the vapor pressure of the solution at 20^$\circ$C:

Correct Answer
verified

Exam 12: Physical Properties of Solutions

Calculate the molality of 6.0 M H2SO4 solution. The density of the solution is 1.34 g/mL.

Correct AnswerverifiedShow Answer

0.102 g of an unknown compound dissolved in 100. mL of water has an osmotic pressure of 28.1 mmHg at 20 ∘\circ∘ C. Calculate the molar mass of the compound.

Correct AnswerverifiedShow Answer

Calculate the molality of a 15.0% by mass solution of MgCl2 in H2O. The density of this solution is 1.127 g/mL.

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A solution made of pentane and hexane has a mole fraction, X = 0.250 of pentane. Hexane is the solvent.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

What is the concentration of O2(g) in water at 25 ∘\circ∘ C exposed to a partial pressure of oxygen of 325 mmHg The Henry's law constant for oxygen gas at 25 ∘\circ∘ C is 1.3 * 10-3 mol/L·atm.

Correct AnswerverifiedShow Answer

The vapor pressure of water at 45.0 ∘\circ∘ C is 71.93 mmHg. Calculate the vapor pressure of a solution of 1.50m K2CO3 at this temperature (assume 100% dissociation) .

Correct AnswerverifiedShow Answer

The density of a 20.3 M CH3OH (methanol) solution is 0.858 g/mL. What is the molality of this solution H2O is the solvent.

Correct AnswerverifiedShow Answer

Using your knowledge of osmosis or osmotic pressure decide if the following statement is true or false: -When sprinkled with sugar, a dish of sliced fruit will form its own juice.

Correct AnswerverifiedShow Answer

What is the freezing point of a solution that contains 10.0 g of glucose (C6H12O6) in 100.g of H2O Kf for water is 1.86 ∘\circ∘ C/m.

Correct AnswerverifiedShow Answer

Determine the mass percent HCl in a 1.2 M solution of hydrochloric acid with a density of 1.019 g/mL.

Correct AnswerverifiedShow Answer

A solution is prepared by adding 40.3 g of Mg(NO3) 2 to 127 g of water. Calculate the mole fraction and molality of magnesium nitrate in this solution.

Correct AnswerverifiedShow Answer

Calculate the approximate freezing point of a solution made from 21.0 g NaCl and 1.00 * 102 g of H2O. [Kf of water is 1.86 ∘\circ∘ C/m.]

Correct AnswerverifiedShow Answer

Arrange the following aqueous solutions in order of increasing boiling points: 0.050m Mg(NO3) 2; 0.100m ethanol; 0.090m NaCl.

Correct AnswerverifiedShow Answer

What is the osmotic pressure of a solution prepared from 13.7 g of the electrolyte HCl and enough water to make 0.500 L of solution at 18 ∘\circ∘ C

Correct AnswerverifiedShow Answer

Which of the following aqueous solutions has the largest molality of benzoic acid (C6H5COOH)

Correct AnswerverifiedShow Answer

What is the molarity and molality of a solution that is 10.00 % by mass potassium hydrogen carbonate (KHCO3, 100.11 g/mol) and has a density of 1.0650 g/mL

Correct AnswerverifiedShow Answer

A solution that is 33.6 % by mass of phenol (C6H5OH) in water is prepared. What is the mole fraction of the phenol

Correct AnswerverifiedShow Answer

The heat of solution

Correct AnswerverifiedShow Answer

A solution is 35.0% by mass carbon tetrachloride (CCl4) in benzene (C6H6) at 20 ∘\circ∘ C. The vapor pressure of pure benzene and pure carbon tetrachloride at this temperature is 74.61 mmHg and 91.32 mmHg, respectively. Calculate the vapor pressure of the solution at 20 ∘\circ∘ C:

Correct AnswerverifiedShow Answer

Calculate the molality of 6.0 M H₂SO₄ solution. The density of the solution is 1.34 g/mL.

Correct Answer
verified

0.102 g of an unknown compound dissolved in 100. mL of water has an osmotic pressure of 28.1 mmHg at 20^$\circ$C. Calculate the molar mass of the compound.

Correct Answer
verified

Calculate the molality of a 15.0% by mass solution of MgCl₂ in H₂O. The density of this solution is 1.127 g/mL.

Correct Answer
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Correct Answer
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Correct Answer
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What is the concentration of O₂(g) in water at 25^$\circ$C exposed to a partial pressure of oxygen of 325 mmHg The Henry's law constant for oxygen gas at 25^$\circ$C is 1.3 * 10^-3 mol/L·atm.

Correct Answer
verified

The vapor pressure of water at 45.0 ^$\circ$C is 71.93 mmHg. Calculate the vapor pressure of a solution of 1.50m K₂CO₃ at this temperature (assume 100% dissociation) .

Correct Answer
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The density of a 20.3 M CH₃OH (methanol) solution is 0.858 g/mL. What is the molality of this solution H₂O is the solvent.

Correct Answer
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Correct Answer
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What is the freezing point of a solution that contains 10.0 g of glucose (C₆H₁₂O₆) in 100.g of H₂O K_f for water is 1.86^$\circ$C/m.

Correct Answer
verified

Correct Answer
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A solution is prepared by adding 40.3 g of Mg(NO₃) ₂ to 127 g of water. Calculate the mole fraction and molality of magnesium nitrate in this solution.

Correct Answer
verified

Calculate the approximate freezing point of a solution made from 21.0 g NaCl and 1.00 * 10² g of H₂O. [K_f of water is 1.86^$\circ$C/m.]

Correct Answer
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Arrange the following aqueous solutions in order of increasing boiling points: 0.050m Mg(NO₃) ₂; 0.100m ethanol; 0.090m NaCl.

Correct Answer
verified

What is the osmotic pressure of a solution prepared from 13.7 g of the electrolyte HCl and enough water to make 0.500 L of solution at 18^$\circ$C

Correct Answer
verified

Which of the following aqueous solutions has the largest molality of benzoic acid (C₆H₅COOH)

Correct Answer
verified

What is the molarity and molality of a solution that is 10.00 % by mass potassium hydrogen carbonate (KHCO₃, 100.11 g/mol) and has a density of 1.0650 g/mL

Correct Answer
verified

A solution that is 33.6 % by mass of phenol (C₆H₅OH) in water is prepared. What is the mole fraction of the phenol

Correct Answer
verified

Correct Answer
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A solution is 35.0% by mass carbon tetrachloride (CCl₄) in benzene (C₆H₆) at 20^$\circ$C. The vapor pressure of pure benzene and pure carbon tetrachloride at this temperature is 74.61 mmHg and 91.32 mmHg, respectively. Calculate the vapor pressure of the solution at 20^$\circ$C:

Correct Answer
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