Colligative Properties Worksheet
1) What mass of water is needed to dissolve 34.8 g of copper(II) sulfate in order
to prepare a 0.521 m solution?
2) The vapor pressure of water at 20° C is 17.5 torr. What is the vapor
pressure of water over a solution containing 300. g C6H12O6 and
455 g of water?
3) Calculate the freezing point of a solution made from 32.7 g of propane,
C3H8, dissolved in 137.0 g of benzene, C6H6. The freezing point of benzene
is 5.50° C and its Kf is 5.12° C/m.
4) Calculate the boiling point of a solution made from 227 g of MgCl2 dissolved
in 700. g of water. What is the boiling point of the solution?
Kb = 0.512° C/m.
5) Calculate the concentration of nitrogen gas in a 1.00 L container exerting a
partial pressure of 572 mm Hg at room temperature. Henry’s law constant
for nitrogen at 25° C is 6.8 x 10-4 mol/L·atm.
6) A solution contains 21.6 g of a nonelectrolyte and 175 g of water. The water
freezes at -7.18° C and Kf = 1.86° C/m. Is the nonelectrolyte CH3OH or
C2H5OH?
