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 25°C and 1.0 atm (kH in H2O at 25°C = 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 32°C. Pure toluene has a vapor pressure of 41 torr at 32°C. (Assume ideal behavior.)

3. The freezing point of benzene is 5.5°C. What is the freezing point of a solution of 8.10 g of naphthalene (C10H8) in 670. g of benzene (Kf of benzene = 4.90°C/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 25°C, the osmotic pressure of this solution is 0.272 atm. What is the molar mass of the polymer sample?

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