1. The vapor pressure of water is 23.76 torr at 25.0 C. Calculate the vapor pressure of a solution of 7.50 grams of formamide, HCONH2m in 1.50×10^2 grams of water.

2. What is the vapor pressure of a mixture of 0.30 moles of acetone and 0.50 moles of methanol at 25C? The vapor pressure of acetone at 25C is 345 torr and the vapor pressure of mathanol at 25C is 295 torr.

3. The normal freezing point of benzene, C6H6, is 5.50C. When 7.14 grams of naphthalene, C10H8, are dissolved in 45.0 grams of benzene, the solution freezes at 0.82C. Calculate the molal freezing point constant of benzene from these data.

4. What are the boiling and freezing temperatures of the solution in Question 1? It contains 7.50 grams of HCONH2 in 1.50×10^2 grams of water. For water kf= -1.86C/m and kb= 0.81C/m.