Problem 1.1:
What is the vapor pressure of the pure solvent if the vapor pressure of a
solution of 10 g of sucrose
(C6H12O6) in 100 g of ethanol
(C2H6O) is 55 mmHg?
Problem 1.2:
What is the freezing point of a solution of 15.0 g of NaCl in 250 g of
water? The molal freezing
point constant, Kf, for water is 1.86 oC kg / mol.
Problem 1.3:
A solution of 0.5 g of an unknown nonvolatile, nonelectrolyte solute is
added to 100 mL of water
and then placed across a semipermeable membrane from a volume of pure
water. When the system
reaches equilibrium, the solution compartment is elevated 5.6 cm above the
solvent compartment.
Assuming that the density of the solution is 1.0 g / mL, calculate the
molecular mass of the unknown.
