Question 1

Calculate the molarity of a solution prepared by dissolving 43.2 grams of pentane (C5H12, molar mass = 72.15 g/mol)  in enough carbon tetrachloride (CCl4, molar mass = 153.8 g/mol)  to take 400 mL of solution.

Accepted Answer

A)   10.8 M
B)   0.600 M
C)   6.01 M
D)   4.17 M
E)   1.50 M

Question 2

A commercial bleaching solution contains 3.62% sodium hypochlorite, NaOCl. What is the mass of NaOCl present in a bottle that contains 4.50×103 g of bleaching solution?

Accepted Answer

A)   8.04×10 - 4 g NaOCl
B)   0.0804 g NaOCl
C)   163 g NaOCl
D)   1.24×103 g NaOCl
E)   1.63×104 g NaOCl

Question 3

One proposed method of producing fresh water from sea water is a process called reverse osmosis. In reverse osmosis enough pressure is applied to force water across a membrane from a solution of high solute concentration to one of low concentration. What is the minimum pressure (in atm)  needed to have reverse osmosis if sea water may be approximated by a solution with a van't Hoff = 1.83 and a concentration of 0.616 M at 20 ° C?

Accepted Answer

A)   14.8 atm
B)   1.85 atm
C)   44.0 atm
D)   1.01 atm
E)   27.1 atm

Question 4

Calculate the mole fraction of water in a solution made by mixing 1.0 g of water and 2.0 g of ethyl alcohol (C2H5OH) .

Accepted Answer

A)   75%
B)   67%
C)   33%
D)   56%
E)   none of these

Question 5

Which of the following combinations of solid and liquid would not be likely to form a solution?

Accepted Answer

A)   ionic solid & non-polar liquid
B)   ionic solid & polar liquid
C)   polar solid & polar liquid
D)   non-polar solid & non-polar liquid
E)   ionic solid & molten ionic liquid

Question 6

Calculate the boiling point of a solution of 0.200 m NaCl in water (kb = 0.512 ° C/m)  if the van't Hoff factor for this solution is 1.91.

Accepted Answer

A)   100.196 ° C
B)   0.196 ° C
C)   99.804 ° C
D)   - 0.196 ° C
E)   100.102 ° C

Question 7

What mass of glycerol (C3H8O3)  must be added tO5 00 grams of water to prevent it from freezing at - 20.0 ° C?
Kf(H2O)  = 1.86 ° C/ m . Molar Mass(C3H8O3)  = 92.09 g/mol

Accepted Answer

A)   1.23 g C3H8O3
B)   17.1 g C3H8O3
C)   495 g C3H8O3
D)   1.98×103 g C3H8O3
E)   6.95×103 g C3H8O3

Question 8

Which expression shown below is correct for solving for the freezing temperature of a solution?

Accepted Answer

A)   Tf, solution = Kf×m
B)   Tf, solution = Kf×m + Tf, solvent
C)   Tf, solution = Kf×M
D)   Tf, solution = Kf×m - Tf, solvent
E)   Tf, solution = Tf, solvent - Kf×m

Question 9

What is the molality of a solution prepared by dissolving 76.5 grams of glycine (NH2CH2COOH)  in 1.280 kg of water?
MM(glycine)  = 75.07 g/mol

Accepted Answer

A)   0.752 m
B)   0.796 m
C)   1.02 m
D)   1.26 m
E)   59.8 m

Question 10

A 0.50 g sample of a protein is dissolved in water to give 10.0 mL of solution. The osmotic pressure is found to be 39 torr at 310 K. What is the molar mass (g/mol)  of the protein?

Accepted Answer

A)   33 g/mol
B)   2.9×103 g/mol
C)   2.5×104 g/mol
D)   4.7×104 g/mol
E)   none of these

Question 11

How many grams of AgNO3 are present in 50.0 mL of a 12.0 M AgNO3 solution?
MM(AgNO3)  = 169.88 g/mol

Accepted Answer

A)   3.53 g of AgNO3
B)   40.8 g of AgNO3
C)   102 g of AgNO3
D)   283 g of AgNO3
E)   708 g of AgNO3

Question 12

The concentration of N2 (g)  dissolved in water that is saturated with air (80 mole % N2)  is 5.87×10 - 4 molal. What is the Henry's law constant for this gas, in molal/atm?

Accepted Answer

A)   4.69×10 - 4
B)   5.87×10 - 4
C)   7.34×10 - 4
D)   1.31×10 - 2
E)   none of these

Question 13

Potassium fluoride is used for frosting glass. What is the molarity of a solution prepared by dissolving 78.6 g of KF in enough water to produce 225 mL of solution?
MM(KF)  = 58.10 g/mol

Accepted Answer

A)   0.304 M
B)   0.349 M
C)   1.35 M
D)   3.29 M
E)   6.01 M

Question 14

What is the boiling point of a solution of ethanol that contains 4.9 grams of vanillin in 47.0 grams of ethanol?
Molar Mass(vanillin)  = 152.14 g/mol; Kb(ethanol)  = 1.22 ° C/ m ; bp(ethanol)  = 78.5 ° C.

Accepted Answer

A)   Tb, solution = 76.7 ° C
B)   Tb, solution = 77.7 ° C
C)   Tb, solution = 78.6 ° C
D)   Tb, solution = 79.3 ° C
E)   Tb, solution = 79.9 ° C

Question 15

What is the freezing point of a solution containing 600 g of CHCl3 and 42.0 g of eucalyptol (C10H18O) , a fragrant substance found in the leaves of eucalyptus trees?
Molar Mass(C10H18O)  = 154.25 g/mol, Tf(CHCl3)  = - 63.5 ° C and Kf(CHCl3)  = 4.68 ° C/ m .

Accepted Answer

A)   - 65.6 ° C
B)   - 63.9 ° C
C)   - 61.4 ° C
D)   2.12 ° C
E)   65.6 ° C

Question 16

Which of the following molecular compounds would be highly soluble in hexane, C6H14?
I. CH3OH
II. C6H6
III. H2O

Accepted Answer

A)   I only
B)   II only
C)   III only
D)   I and II
E)   I and III

Question 17

At 35 ° C the vapor pressure of chloroform is 0.359 atm and that of acetone is 0.453 atm. Assuming ideal behavior, what is the vapor pressure of chloroform above a solution containing 1.00 mole of chloroform and 4.00 moles of acetone?

Accepted Answer

A)   0.0718 atm
B)   0.0900 atm
C)   0.362 atm
D)   0.359 atm
E)   none of these

Question 18

A water solution of hemoglobin at 310 K has a concentration of 1.00×10 - 3 M. What is the osmotic pressure of the solution?

Accepted Answer

A)   39.4 atm
B)   2.54×10 - 2 atm
C)   2.24×10 - 2 atm
D)   1.00×10 - 3 atm
E)   none of these

Question 19

Arrange the following aqueous solutions in order of increasing boiling point. 0.12 M K2SO4 0.20 M C6H12O6 (glucose)  0.15 M Na3PO4

Accepted Answer

A)   (lowest bp)  0.12 M K2SO4 6H12O6 3PO4 (highest bp) 
B)   (lowest bp)  0.20 M C6H12O6 2SO4 3PO4 (highest bp) 
C)   (lowest bp)  0.15 M Na3PO4 6H12O6 2SO4 (highest bp) 
D)   (lowest bp)  0.15 M Na3PO4 2SO4 6H12O6 (highest bp) 
E)   (lowest bp)  0.20 M C6H12O6 3PO4 2SO4 (highest bp)

Question 20

What is the boiling point of an aqueous 1.0 m solution of glucose?
Kb(H2O)  = 0.51 ° C/ m ; bp(H2O)  = 100.0 ° C.

Accepted Answer

A)   0.5 ° C
B)   1.9 ° C
C)   98.1 ° C
D)   99.5 ° C
E)   100.5 ° C

Exam 12: Solutions

Which of the following combinations of solid and liquid would not be likely to form a solution?

Correct Answer
verified

Calculate the molarity of a solution prepared by dissolving 43.2 grams of pentane (C₅H₁₂, molar mass = 72.15 g/mol) in enough carbon tetrachloride (CCl₄, molar mass = 153.8 g/mol) to take 400 mL of solution.

Correct Answer
verified

A water solution of hemoglobin at 310 K has a concentration of 1.00×10^{- 3} M. What is the osmotic pressure of the solution?

Correct Answer
verified

Which of the following molecular compounds would be highly soluble in hexane, C₆H₁₄? I. CH₃OH II. C₆H₆ III. H₂O

Correct Answer
verified

What is the molality of a solution prepared by dissolving 76.5 grams of glycine (NH₂CH₂COOH) in 1.280 kg of water? MM(glycine) = 75.07 g/mol

Correct Answer
verified

At 35 ° C the vapor pressure of chloroform is 0.359 atm and that of acetone is 0.453 atm. Assuming ideal behavior, what is the vapor pressure of chloroform above a solution containing 1.00 mole of chloroform and 4.00 moles of acetone?

Correct Answer
verified

Which expression shown below is correct for solving for the freezing temperature of a solution?

Correct Answer
verified

What is the boiling point of a solution of ethanol that contains 4.9 grams of vanillin in 47.0 grams of ethanol? Molar Mass(vanillin) = 152.14 g/mol; K_b(ethanol) = 1.22 ° C/ m ; bp(ethanol) = 78.5 ° C.

Correct Answer
verified

Calculate the mole fraction of water in a solution made by mixing 1.0 g of water and 2.0 g of ethyl alcohol (C₂H₅OH) .

Correct Answer
verified

A 0.50 g sample of a protein is dissolved in water to give 10.0 mL of solution. The osmotic pressure is found to be 39 torr at 310 K. What is the molar mass (g/mol) of the protein?

Correct Answer
verified

What is the freezing point of a solution containing 600 g of CHCl₃ and 42.0 g of eucalyptol (C₁₀H₁₈O) , a fragrant substance found in the leaves of eucalyptus trees? Molar Mass(C₁₀H₁₈O) = 154.25 g/mol, T_f(CHCl₃) = - 63.5 ° C and K_f(CHCl₃) = 4.68 ° C/ m .

Correct Answer
verified

A commercial bleaching solution contains 3.62% sodium hypochlorite, NaOCl. What is the mass of NaOCl present in a bottle that contains 4.50×10³ g of bleaching solution?

Correct Answer
verified

What mass of glycerol (C₃H₈O₃) must be added tO₅ 00 grams of water to prevent it from freezing at - 20.0 ° C? K_f(H₂O) = 1.86 ° C/ m . Molar Mass(C₃H₈O₃) = 92.09 g/mol

Correct Answer
verified

The concentration of N₂ (g) dissolved in water that is saturated with air (80 mole % N₂) is 5.87×10^{- 4} molal. What is the Henry's law constant for this gas, in molal/atm?

Correct Answer
verified

Arrange the following aqueous solutions in order of increasing boiling point. 0.12 M K₂SO₄ 0.20 M C₆H₁₂O₆ (glucose) 0.15 M Na₃PO₄

Correct Answer
verified

Calculate the boiling point of a solution of 0.200 m NaCl in water (k_b = 0.512 ° C/m) if the van't Hoff factor for this solution is 1.91.

Correct Answer
verified

How many grams of AgNO₃ are present in 50.0 mL of a 12.0 M AgNO₃ solution? MM(AgNO₃) = 169.88 g/mol

Correct Answer
verified

What is the boiling point of an aqueous 1.0 m solution of glucose? K_b(H₂O) = 0.51 ° C/ m ; bp(H₂O) = 100.0 ° C.

Correct Answer
verified

Correct Answer
verified

Potassium fluoride is used for frosting glass. What is the molarity of a solution prepared by dissolving 78.6 g of KF in enough water to produce 225 mL of solution? MM(KF) = 58.10 g/mol

Correct Answer
verified

Exam 12: Solutions

Which of the following combinations of solid and liquid would not be likely to form a solution?

Correct AnswerverifiedShow Answer

Calculate the molarity of a solution prepared by dissolving 43.2 grams of pentane (C5H12, molar mass = 72.15 g/mol) in enough carbon tetrachloride (CCl4, molar mass = 153.8 g/mol) to take 400 mL of solution.

Correct AnswerverifiedShow Answer

A water solution of hemoglobin at 310 K has a concentration of 1.00×10 - 3 M. What is the osmotic pressure of the solution?

Correct AnswerverifiedShow Answer

Which of the following molecular compounds would be highly soluble in hexane, C6H14? I. CH3OH II. C6H6 III. H2O

Correct AnswerverifiedShow Answer

What is the molality of a solution prepared by dissolving 76.5 grams of glycine (NH2CH2COOH) in 1.280 kg of water? MM(glycine) = 75.07 g/mol

Correct AnswerverifiedShow Answer

At 35 ° C the vapor pressure of chloroform is 0.359 atm and that of acetone is 0.453 atm. Assuming ideal behavior, what is the vapor pressure of chloroform above a solution containing 1.00 mole of chloroform and 4.00 moles of acetone?

Correct AnswerverifiedShow Answer

Which expression shown below is correct for solving for the freezing temperature of a solution?

Correct AnswerverifiedShow Answer

What is the boiling point of a solution of ethanol that contains 4.9 grams of vanillin in 47.0 grams of ethanol? Molar Mass(vanillin) = 152.14 g/mol; Kb(ethanol) = 1.22 ° C/ m ; bp(ethanol) = 78.5 ° C.

Correct AnswerverifiedShow Answer

Calculate the mole fraction of water in a solution made by mixing 1.0 g of water and 2.0 g of ethyl alcohol (C2H5OH) .

Correct AnswerverifiedShow Answer

A 0.50 g sample of a protein is dissolved in water to give 10.0 mL of solution. The osmotic pressure is found to be 39 torr at 310 K. What is the molar mass (g/mol) of the protein?

Correct AnswerverifiedShow Answer

What is the freezing point of a solution containing 600 g of CHCl3 and 42.0 g of eucalyptol (C10H18O) , a fragrant substance found in the leaves of eucalyptus trees? Molar Mass(C10H18O) = 154.25 g/mol, Tf(CHCl3) = - 63.5 ° C and Kf(CHCl3) = 4.68 ° C/ m .

Correct AnswerverifiedShow Answer

A commercial bleaching solution contains 3.62% sodium hypochlorite, NaOCl. What is the mass of NaOCl present in a bottle that contains 4.50×103 g of bleaching solution?

Correct AnswerverifiedShow Answer

What mass of glycerol (C3H8O3) must be added tO5 00 grams of water to prevent it from freezing at - 20.0 ° C? Kf(H2O) = 1.86 ° C/ m . Molar Mass(C3H8O3) = 92.09 g/mol

Correct AnswerverifiedShow Answer

The concentration of N2 (g) dissolved in water that is saturated with air (80 mole % N2) is 5.87×10 - 4 molal. What is the Henry's law constant for this gas, in molal/atm?

Correct AnswerverifiedShow Answer

Arrange the following aqueous solutions in order of increasing boiling point. 0.12 M K2SO4 0.20 M C6H12O6 (glucose) 0.15 M Na3PO4

Correct AnswerverifiedShow Answer

Calculate the boiling point of a solution of 0.200 m NaCl in water (kb = 0.512 ° C/m) if the van't Hoff factor for this solution is 1.91.

Correct AnswerverifiedShow Answer

How many grams of AgNO3 are present in 50.0 mL of a 12.0 M AgNO3 solution? MM(AgNO3) = 169.88 g/mol

Correct AnswerverifiedShow Answer

What is the boiling point of an aqueous 1.0 m solution of glucose? Kb(H2O) = 0.51 ° C/ m ; bp(H2O) = 100.0 ° C.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Potassium fluoride is used for frosting glass. What is the molarity of a solution prepared by dissolving 78.6 g of KF in enough water to produce 225 mL of solution? MM(KF) = 58.10 g/mol

Correct AnswerverifiedShow Answer

Correct Answer
verified

Calculate the molarity of a solution prepared by dissolving 43.2 grams of pentane (C₅H₁₂, molar mass = 72.15 g/mol) in enough carbon tetrachloride (CCl₄, molar mass = 153.8 g/mol) to take 400 mL of solution.

Correct Answer
verified

A water solution of hemoglobin at 310 K has a concentration of 1.00×10^{- 3} M. What is the osmotic pressure of the solution?

Correct Answer
verified

Which of the following molecular compounds would be highly soluble in hexane, C₆H₁₄? I. CH₃OH II. C₆H₆ III. H₂O

Correct Answer
verified

What is the molality of a solution prepared by dissolving 76.5 grams of glycine (NH₂CH₂COOH) in 1.280 kg of water? MM(glycine) = 75.07 g/mol

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

What is the boiling point of a solution of ethanol that contains 4.9 grams of vanillin in 47.0 grams of ethanol? Molar Mass(vanillin) = 152.14 g/mol; K_b(ethanol) = 1.22 ° C/ m ; bp(ethanol) = 78.5 ° C.

Correct Answer
verified

Calculate the mole fraction of water in a solution made by mixing 1.0 g of water and 2.0 g of ethyl alcohol (C₂H₅OH) .

Correct Answer
verified

Correct Answer
verified

What is the freezing point of a solution containing 600 g of CHCl₃ and 42.0 g of eucalyptol (C₁₀H₁₈O) , a fragrant substance found in the leaves of eucalyptus trees? Molar Mass(C₁₀H₁₈O) = 154.25 g/mol, T_f(CHCl₃) = - 63.5 ° C and K_f(CHCl₃) = 4.68 ° C/ m .

Correct Answer
verified

A commercial bleaching solution contains 3.62% sodium hypochlorite, NaOCl. What is the mass of NaOCl present in a bottle that contains 4.50×10³ g of bleaching solution?

Correct Answer
verified

What mass of glycerol (C₃H₈O₃) must be added tO₅ 00 grams of water to prevent it from freezing at - 20.0 ° C? K_f(H₂O) = 1.86 ° C/ m . Molar Mass(C₃H₈O₃) = 92.09 g/mol

Correct Answer
verified

The concentration of N₂ (g) dissolved in water that is saturated with air (80 mole % N₂) is 5.87×10^{- 4} molal. What is the Henry's law constant for this gas, in molal/atm?

Correct Answer
verified

Arrange the following aqueous solutions in order of increasing boiling point. 0.12 M K₂SO₄ 0.20 M C₆H₁₂O₆ (glucose) 0.15 M Na₃PO₄

Correct Answer
verified

Calculate the boiling point of a solution of 0.200 m NaCl in water (k_b = 0.512 ° C/m) if the van't Hoff factor for this solution is 1.91.

Correct Answer
verified

How many grams of AgNO₃ are present in 50.0 mL of a 12.0 M AgNO₃ solution? MM(AgNO₃) = 169.88 g/mol

Correct Answer
verified

What is the boiling point of an aqueous 1.0 m solution of glucose? K_b(H₂O) = 0.51 ° C/ m ; bp(H₂O) = 100.0 ° C.

Correct Answer
verified

Correct Answer
verified

Correct Answer
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