1- A solute added to a solvent raises the boiling point of the solution because a) the temperature to cause boiling must be great enough to boil not only the solvent but also the solute

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1- A solute added to a solvent raises the boiling point of the solution because

a) the temperature to cause boiling must be great enough to boil not only the solvent but also the solute.

b) the solute particles lower the solvent's vapor pressure, thus requiring a higher temperature to cause boiling.

c) the solute particles raise the solvent's vapor pressure, thus requiring a higher temperature to cause boiling.

d) the solute increases the volume of the solution, and an increase in volume requires an increase in the temperature to reach the boiling point (derived from PV = nRT).

2- When a 19.8-g sample of an unknown compound is dissolved in 522.0 g of benzene, the freezing point of the resulting solution of 3.86°C. The freezing point of pure benzene is 5.48°C, and Kf for benzene is 5.12°C/m. Calculate the molar mass of the unknown compound.

a) 32.7 g/mol

b) 8340 g/mol

c) 803 g/mol

d) 120 g/mol

3- A cucumber is placed in a concentrated salt solution. What is most likely to happen?

a) Water will flow from the cucumber to the solution.

b) Water will flow from the solution to the cucumber.

c) Salt will flow into the cucumber.

d) No change will occur.

4- 1.40 g of a polyethylene sample was dissolved in enough benzene to make 100. mL of solution, and the osmotic pressure was found to be 1.86 torr at 25°C. What is the molar mass of the polyethylene?

a) 1.06 x 10? g/mol

b) 1.19 x 10? g/mol

c) 5720 g/mol

d) 1.40 x 10? g/mol

5- Which of the following aqueous solutions would have the highest boiling point?

a) 1.0 m NaNO?

b) 1.0 m HF

c) 1.0 m CaCl?

d) 1.0 m C?H??O?

6- Which one of the following aqueous solutions would have the highest freezing point?

a) 1.0 m C?H??O?

b) 1.0 m NaNO?

c) 2.0 m CH?OH

d) 1.0 m CaCl?