Question 1

The vapor pressure of water at 45.0 °C is 71.93 mmHg.What is the vapor pressure of water over a solution prepared from 75.0 g of citric acid (C6H8O7) in 0.420 kg of water at this temperature?

Accepted Answer

A)  1.22 mmHg
B)  42.3 mmHg
C)  43.0 mmHg
D)  70.7 mmHg
E)  73.2 mmHgF) C) and D)
G) B) and D) D

Question 2

Using your knowledge of osmosis or osmotic pressure explain the following statement: Meat that is salted before cooking tends to dry out.

Accepted Answer

The water passes thr...

Question 3

A solution that contains 55.0 g of ascorbic acid (VitaminC) in 250.g of water freezes at -2.34°C.Calculate the molar mass (in units of g/mol) of the solute.Kf of water is 1.86°C/m.

Accepted Answer

A)  1.26
B)  10.9
C)  43.6
D)  175
E)  277F) C) and D)
G) None of the above

Question 4

The solubility of gases in water usually increases with

Accepted Answer

A)  increasing pressure and increasing temperature
B)  increasing temperature and decreasing pressure
C)  decreasing temperature and increasing pressure
D)  decreasing temperature and decreasing pressure
E)  increasing temperature onlyF) A) and B)
G) A) and C)

Question 5

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°C?

Accepted Answer

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

Question 6

The vapor pressure of water at 20°C is 17.5 mmHg.What is the vapor pressure of water over a solution prepared from 2.00 × 102 g of sucrose (C12H22O11) and 3.50 × 102 g water?

Accepted Answer

A)  0.51 mmHg
B)  16.0 mmHg
C)  17.0 mmHg
D)  18.0 mmHg
E)  19.4 mmHgF) C) and D)
G) B) and E)

Question 7

Calculate the mole fraction of KI in a solution made by dissolving 3.4 g of KI in 5.8 g of water.

Accepted Answer

A)  0.060
B)  0.064
C)  0.37
D)  0.59
E)  6.4F) A) and C)
G) All of the above

Question 8

Some KCl is dissolved in water at 25°C, where it completely dissociates.The vapor pressure of pure water at 25°C is 28.3 mmHg.Estimate the mass in grams of KCl needed per liter of pure water to reduce the vapor pressure of water at 25°C by 5%.

Accepted Answer

The answer of Some KCl is dissolved in water at...

Question 9

A 1.35 m solution of NaOCl in water is prepared.What is the mole fraction of the NaOCl?

Accepted Answer

A)  0.0135
B)  0.0243
C)  0.0271
D)  0.0237
E)  0.0263F) D) and E)
G) A) and B)

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) B) and C)

Question 11

What is the molarity of a solution that is 7.00% by mass magnesium sulfate and has a density of 1.071 g/mL?

Accepted Answer

A)  0.0890 M
B)  0.496 M
C)  0.543 M
D)  0.623 M
E)  1.32 MF) B) and E)
G) A) and D) D

Question 12

What is the osmotic pressure of a 0.25 M solution of sucrose at 37°C? (R = 0.0821 L.atm/K.mol)

Accepted Answer

A)  6.6 × 10-5 atm
B)  0.76 atm
C)  6.4 atm
D)  100 atm
E)  940 atmF) A) and B)
G) A) and C) C

Question 13

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) C) and D)
G) A) and D)

Question 14

What is the mass percent CH3OH of a 0.256 m CH3OH(aq) solution.

Accepted Answer

A)  0.819 %
B)  0.992 %
C)  1.23 %
D)  1.29 %
E)  1.51 %F) B) and E)
G) A) and C)

Question 15

What is the percent CsCl by mass in a 0.711 M CsCl solution that has a density of 1.091 g/mL?

Accepted Answer

A)  3.87 × 10-4 %
B)  3.87 × 10-1 %
C)  11.0 %
D)  1.10 %
E)  6.50 × 10-2  %F) A) and B)
G) A) and C)

Question 16

Assuming 100% dissociation, which of the following compounds is listed incorrectly with its van't Hoff factor i?

Accepted Answer

A)  Na2SO4, i = 3
B)  NH4NO3, i = 2
C)  Sucrose, i = 1
D)  Al2(SO4) 3, i = 4
E)  Mg(NO3) 2, i = 3F) B) and C)
G) B) and D)

Question 17

Calculate the freezing point of a solution made from 22.0 g of octane (C8H18) dissolved in 148.0 g of benzene.Benzene freezes at 5.50°C and its Kf value is 5.12°C/m.

Accepted Answer

A)  -1.16°C
B)  0.98°C
C)  5.49°C
D)  6.66°C
E)  12.2°CF) A) and B)
G) All of the above

Question 18

To interconvert the concentration units of molality (m)and mass percent, you must also know the density of the solution.

Accepted Answer

A) True 
 B)False

Question 19

The vapor pressure of a solution depends on the chemical nature of the non-volatile solute

Accepted Answer

A) True 
 B)False

Question 20

What is the boiling point of an aqueous solution of a nonelectrolyte that has an osmotic pressure of 10.50 atm at 25°C? Kb of water is 0.52°C/m.Assume the density of the solution is the same as that of pure water.

Accepted Answer

A)  0.22°C
B)  0.429°C
C)  99.78°C
D)  100.22°C
E)  100.43°CF) C) and D)
G) A) and B)

Exam 12: Physical Properties of Solutions

The vapor pressure of water at 45.0 °C is 71.93 mmHg.What is the vapor pressure of water over a solution prepared from 75.0 g of citric acid (C6H8O7) in 0.420 kg of water at this temperature?

Correct AnswerverifiedD

Using your knowledge of osmosis or osmotic pressure explain the following statement: Meat that is salted before cooking tends to dry out.

Correct AnswerverifiedThe water passes thr...View AnswerShow Answer

A solution that contains 55.0 g of ascorbic acid (VitaminC) in 250.g of water freezes at -2.34°C.Calculate the molar mass (in units of g/mol) of the solute.Kf of water is 1.86°C/m.

Correct AnswerverifiedShow Answer

The solubility of gases in water usually increases with

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°C?

Correct AnswerverifiedShow Answer

The vapor pressure of water at 20°C is 17.5 mmHg.What is the vapor pressure of water over a solution prepared from 2.00 × 102 g of sucrose (C12H22O11) and 3.50 × 102 g water?

Correct AnswerverifiedShow Answer

Calculate the mole fraction of KI in a solution made by dissolving 3.4 g of KI in 5.8 g of water.

Correct AnswerverifiedShow Answer

Some KCl is dissolved in water at 25°C, where it completely dissociates.The vapor pressure of pure water at 25°C is 28.3 mmHg.Estimate the mass in grams of KCl needed per liter of pure water to reduce the vapor pressure of water at 25°C by 5%.

Correct AnswerverifiedShow Answer

A 1.35 m solution of NaOCl in water is prepared.What is the mole fraction of the NaOCl?

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

What is the molarity of a solution that is 7.00% by mass magnesium sulfate and has a density of 1.071 g/mL?

Correct AnswerverifiedD

What is the osmotic pressure of a 0.25 M solution of sucrose at 37°C? (R = 0.0821 L.atm/K.mol)

Correct AnswerverifiedC

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

What is the mass percent CH3OH of a 0.256 m CH3OH(aq) solution.

Correct AnswerverifiedShow Answer

What is the percent CsCl by mass in a 0.711 M CsCl solution that has a density of 1.091 g/mL?

Correct AnswerverifiedShow Answer

Assuming 100% dissociation, which of the following compounds is listed incorrectly with its van't Hoff factor i?

Correct AnswerverifiedShow Answer

Calculate the freezing point of a solution made from 22.0 g of octane (C8H18) dissolved in 148.0 g of benzene.Benzene freezes at 5.50°C and its Kf value is 5.12°C/m.

Correct AnswerverifiedShow Answer

To interconvert the concentration units of molality (m)and mass percent, you must also know the density of the solution.

Correct AnswerverifiedShow Answer

The vapor pressure of a solution depends on the chemical nature of the non-volatile solute

Correct AnswerverifiedShow Answer

What is the boiling point of an aqueous solution of a nonelectrolyte that has an osmotic pressure of 10.50 atm at 25°C? Kb of water is 0.52°C/m.Assume the density of the solution is the same as that of pure water.

Correct AnswerverifiedShow Answer

The vapor pressure of water at 45.0 °C is 71.93 mmHg.What is the vapor pressure of water over a solution prepared from 75.0 g of citric acid (C₆H₈O₇) in 0.420 kg of water at this temperature?

Correct Answer
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D

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The water passes thr...
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A solution that contains 55.0 g of ascorbic acid (VitaminC) in 250.g of water freezes at -2.34°C.Calculate the molar mass (in units of g/mol) of the solute.K_f of water is 1.86°C/m.

Correct Answer
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Correct Answer
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Correct Answer
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The vapor pressure of water at 20°C is 17.5 mmHg.What is the vapor pressure of water over a solution prepared from 2.00 × 10² g of sucrose (C₁₂H₂₂O₁₁) and 3.50 × 10² g water?

Correct Answer
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Correct Answer
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Correct Answer
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D

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C

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.

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What is the mass percent CH₃OH of a 0.256 m CH₃OH(aq) solution.

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Correct Answer
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Calculate the freezing point of a solution made from 22.0 g of octane (C₈H₁₈) dissolved in 148.0 g of benzene.Benzene freezes at 5.50°C and its K_f value is 5.12°C/m.

Correct Answer
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Correct Answer
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Correct Answer
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What is the boiling point of an aqueous solution of a nonelectrolyte that has an osmotic pressure of 10.50 atm at 25°C? K_b of water is 0.52°C/m.Assume the density of the solution is the same as that of pure water.

Correct Answer
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