Question 1

Calculate the mass of maltose, C12H22O11, contained in 725.0 mL of solution if the measured vapour pressure of the solution is 41.6 mbar at 30 °C. The vapour pressure of pure water at 30 °C is 42.40 mbar; assume no change in volume occurs upon dissolution.

Accepted Answer

A)   482 g
B)   329 g
C)   265 g
D)   163 g
E)   94.1 gF) A) and B)
G) A) and E)

Question 2

Determine the vapour pressure of a solution at 55 °C that contains 34.2 g NaCl in 375 mL of water. The vapour pressure of pure water at 55 °C is 0.1574 bar.

Accepted Answer

A)   0.153 bar
B)   0.127 bar
C)   0.0967 bar
D)   0.108 bar
E)   0.0907 barF) C) and E)
G) C) and D)

Question 3

Place the following solutions in order of increasing osmotic pressure. I. 0.15 mol L-1 C2H6O2 II. 0.15 mol L-1 MgCl2 III. 0.15 mol L-1 NaCl

Accepted Answer

A)   III 
B)   II 
C)   I 
D)   II 
E)   I < III < IIF) A) and E)
G) A) and B)

Question 4

What is the mole fraction of ethanol in a solution made by dissolving 29.2 g of ethanol, C2H5OH, in 53.6 g of water?

Accepted Answer

A)   0. 176
B)   0. 213
C)   0. 352
D)   0. 545E) A) and B)
F) A) and C)

Question 5

A compound is found to have a molar mass of 598 g mol-1. If 35.8 mg of the compound is dissolved in enough water to make 175 mL of solution at 25 °C, what is the osmotic pressure of the resulting solution?

Accepted Answer

A)   3.42 × 10-3 bar
B)   8.48 × 10-3 bar
C)   5.01 × 10-3 bar
D)   5.99 × 10-3 bar
E)   8.06 × 10-3 barF) A) and E)
G) B) and E)

Question 6

A solution is prepared by adding 1.43 mol of KCl to 889 g of water. The concentration of KCl is ________ molal.

Accepted Answer

A)   622
B)   1.27 × 103
C)   1.61 × 10-3
D)   0.622
E)   1.61F) C) and D)
G) A) and E)

Question 7

A solution is prepared by dissolving 49.3 g of KBr in enough water to form 473 mL of solution. Calculate the mass % of KBr in the solution if the density is 1.12 g mL-1.

Accepted Answer

A)   10.4%
B)   8.57%
C)   10.1%
D)   11.7%
E)   9.31%F) B) and D)
G) C) and E)

Exam 12: Solutions

A solution is prepared by dissolving 49.3 g of KBr in enough water to form 473 mL of solution. Calculate the mass % of KBr in the solution if the density is 1.12 g mL^-1.

Correct Answer
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Calculate the mass of maltose, C₁₂H₂₂O₁₁, contained in 725.0 mL of solution if the measured vapour pressure of the solution is 41.6 mbar at 30 °C. The vapour pressure of pure water at 30 °C is 42.40 mbar; assume no change in volume occurs upon dissolution.

Correct Answer
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Place the following solutions in order of increasing osmotic pressure. I. 0.15 mol L^-1 C₂H₆O₂ II. 0.15 mol L^-1 MgCl₂ III. 0.15 mol L^-1 NaCl

Correct Answer
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A compound is found to have a molar mass of 598 g mol^-1. If 35.8 mg of the compound is dissolved in enough water to make 175 mL of solution at 25 °C, what is the osmotic pressure of the resulting solution?

Correct Answer
verified

Determine the vapour pressure of a solution at 55 °C that contains 34.2 g NaCl in 375 mL of water. The vapour pressure of pure water at 55 °C is 0.1574 bar.

Correct Answer
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What is the mole fraction of ethanol in a solution made by dissolving 29.2 g of ethanol, C₂H₅OH, in 53.6 g of water?

Correct Answer
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A solution is prepared by adding 1.43 mol of KCl to 889 g of water. The concentration of KCl is ________ molal.

Correct Answer
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Exam 12: Solutions

A solution is prepared by dissolving 49.3 g of KBr in enough water to form 473 mL of solution. Calculate the mass % of KBr in the solution if the density is 1.12 g mL-1.

Correct AnswerverifiedShow Answer

Calculate the mass of maltose, C12H22O11, contained in 725.0 mL of solution if the measured vapour pressure of the solution is 41.6 mbar at 30 °C. The vapour pressure of pure water at 30 °C is 42.40 mbar; assume no change in volume occurs upon dissolution.

Correct AnswerverifiedShow Answer

Place the following solutions in order of increasing osmotic pressure. I. 0.15 mol L-1 C2H6O2 II. 0.15 mol L-1 MgCl2 III. 0.15 mol L-1 NaCl

Correct AnswerverifiedShow Answer

A compound is found to have a molar mass of 598 g mol-1. If 35.8 mg of the compound is dissolved in enough water to make 175 mL of solution at 25 °C, what is the osmotic pressure of the resulting solution?

Correct AnswerverifiedShow Answer

Determine the vapour pressure of a solution at 55 °C that contains 34.2 g NaCl in 375 mL of water. The vapour pressure of pure water at 55 °C is 0.1574 bar.

Correct AnswerverifiedShow Answer

What is the mole fraction of ethanol in a solution made by dissolving 29.2 g of ethanol, C2H5OH, in 53.6 g of water?

Correct AnswerverifiedShow Answer

A solution is prepared by adding 1.43 mol of KCl to 889 g of water. The concentration of KCl is ________ molal.

Correct AnswerverifiedShow Answer

A solution is prepared by dissolving 49.3 g of KBr in enough water to form 473 mL of solution. Calculate the mass % of KBr in the solution if the density is 1.12 g mL^-1.

Correct Answer
verified

Calculate the mass of maltose, C₁₂H₂₂O₁₁, contained in 725.0 mL of solution if the measured vapour pressure of the solution is 41.6 mbar at 30 °C. The vapour pressure of pure water at 30 °C is 42.40 mbar; assume no change in volume occurs upon dissolution.

Correct Answer
verified

Place the following solutions in order of increasing osmotic pressure. I. 0.15 mol L^-1 C₂H₆O₂ II. 0.15 mol L^-1 MgCl₂ III. 0.15 mol L^-1 NaCl

Correct Answer
verified

A compound is found to have a molar mass of 598 g mol^-1. If 35.8 mg of the compound is dissolved in enough water to make 175 mL of solution at 25 °C, what is the osmotic pressure of the resulting solution?

Correct Answer
verified

Correct Answer
verified

What is the mole fraction of ethanol in a solution made by dissolving 29.2 g of ethanol, C₂H₅OH, in 53.6 g of water?

Correct Answer
verified

Correct Answer
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