# Solved > 51) An aqueous solution has a normal boiling:2014597 …

51) An aqueous solution has a normal boiling point of 103.0°C. What is the freezing point of this solution? For water and

A) -0.82°C

B) -3.0°C

C) -3.6°C

D) -11°C

52) A solution is prepared by adding 30.00 g of lactose (milk sugar) to 110.0 g of water at The partial pressure of water above the solution is ________ torr. The vapor pressure of pure water at 55°C is 118.0 torr. The MW of lactose is

A) 1.670

B) 94.1

C) 169.4

D) 116.3

E) 92.7

53) A solution is prepared by dissolving 7.00 g of glycerin () in 201 g of ethanol The freezing point of the solution is ________°C. The freezing point of pure ethanol is at 1 atm. The molal-freezing-point-depression constant () for ethanol is The molar masses of glycerin and of ethanol are 92.1 g/mol and 46.1 g/mol, respectively.

A) -121.3

B) 0.752

C) -107.9

D) -113.8

E) -115.4

54) Calculate the freezing point of a solution containing 5.0 grams of KCl and 550.0 grams of water. The molal-freezing-point-depression constant () for water is

A) -0.45 oC

B) +0.45 oC

C) -0.23 oC

D) +0.23 oC

E) 1.23 oC

55) The osmotic pressure of a solution formed by dissolving 25.0 mg of aspirin in enough water to make 0.250 L of solution at 25°C is ________ atm.

A) 13.6

B) 1.14 ×

C) 0.0136

D) 2.45

E) 1.38

56) Place the following aqueous solutions of nonvolatile, nonionic compounds in order of decreasing osmotic pressure.

I. 0.011 M sucroseII. 0.00095 M  galactoseIII. 0.0060 M glycerin

A) I > III > II

B) I > II > III

C) II > III > I

D) III > I > II

E) II > I > III

57) Place the following solutions in order of increasing osmotic pressure.

I. 0.15 M C2H6O2II. 0.15 M BaCl2III. 0.15 M NaI

A) III < I < II

B) II < III < I

C) I < II < III

D) II < I < III

E) I < III < II

58) Identify the solute with the highest van’t Hoff factor.

A) nonelectrolyte

B) KI

C) MgSO4

D) CaCl2

E) AlCl3

59) Identify the solute with the lowest van’t Hoff factor.

A) nonelectrolyte

B) KI

C) MgSO4

D) CaCl2

E) AlCl3

60) Which of the following solutions will have the lowest freezing point?

A) 0.010 m K Br

B) 0.010 m Na2CO3

C) 0.035 m CH3CH2OH

D) 0.015 m BaCl2

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