Thursday
April 24, 2014

Homework Help: chemistry

Posted by Ashley on Monday, January 31, 2011 at 3:49pm.

1. If a gaseous sample contains 73% N2 by volume, what is the solubility of N2 in water at 25C and 1.0 atm (kH in H2O at 25C = 7.0 10-4 mol/Latm)?

2. Calculate the vapor pressure of a solution of 0.60 mol of cholesterol in 4.5 mol of toluene at 32C. Pure toluene has a vapor pressure of 41 torr at 32C. (Assume ideal behavior.)

3. The freezing point of benzene is 5.5C. What is the freezing point of a solution of 8.10 g of naphthalene (C10H8) in 670. g of benzene (Kf of benzene = 4.90C/m)?

4. In a study designed to prepare new gasoline-resistant coatings, a polymer chemist dissolves 6.111 g poly(vinyl alcohol) in enough water to make 100.0 mL of solution. At 25C, the osmotic pressure of this solution is 0.272 atm. What is the molar mass of the polymer sample?

Someone please explain these questions?

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