Chapter 11 Practice ws #2
Objective # 7, 8, 9
Name: ______________________________
Date: ________
Hour: ______
1. The solubility of oxygen in water at 0C and 1 atm is 0.073 g per liter. What is k in Henry’s
law for this temperature?
2. The solubility of nitrogen at 0C in water is 8.21 X 10-4 mol/L if the N2 pressure above the
water is 0.790 atm. What is the solubility at 1 atm of N2 and 0C?
3. What is the Henry’s law k for nitrogen in Problem 2?
4. The solubility of nitrogen in blood at 37C and 0.80 atm 5.6 X 10-4 M. If a deep sea diver
breathes compressed air from a tankat a partial pressure of 3 atm, what would the solubility of
nitrogen be in the diver’s blood at 37C?
5. The solubility of CO2 in water at 25C and 1 atm is 0.034 M. What is the Henry’s law constant
(k)? What would the solubility of CO2 in water be at 0.038 atm and 25C?
6. The vapor pressure of ethanol at 40C is 135.3 torr. Calculate the vapor pressure of a solution
of 53.6 g of glycerin, C3H8O3, in 133.7 g of ethanol, C2H5OH, at 40C.
7. Antifreeze solutions are mainly ethylene glycol, C2H6O2, in water. Calculate the vapor
pressure of a solution made by adding 101.6 g of ethylene glycol to 139.6 g of water at 50.0C.
At this temperature ethylene glycol is essentially nonvolatile, and the vapor pressure of water is
92.51 torr.
8. Sucrose, C12H22O11 (a nonvolatile substance), is a sweetener. A solution was made with 35.2 g
of sucrose and 78.0 g of water at 30C. Calculate the vapor pressure of the solution if the vapor
pressure of water at 30C is 31.824 torr.
9. How many grams of a nonvolatile compound B (molar mass = 97.8 g/mol) would need to be
added to 250 g of water to produce a solution with a vapor pressure of 23.756 torr? The vapor
pressure of water at this temperature is 42.362 torr.
10. Calculate the vapor pressure of a solution made with 321 g of toluene (C7H8) and 398 g of
benzene (C6H6). At 60C, the vapor pressure of the two volatile components are 140. torr and
396 torr, respectively.
11. What is the vapor pressure of a solution made by adding 26.93 g potassium sodium tartrate,
KNaC4H4O6 to 676.5 g of water at 25C? The vapor pressure of pure water is 23.756 torr at
25C. Assume that potassium sodium tartrate is nonelectrolyte (a poor assumption).