Chapter 13, Problem 113IE

At 35 o C the vapor pressure of acetone, (CH₃)₂CO, is 360 torr, and that of chloroform, CHCI₃, is 300 torr. Acetone and chloroform can form very weak hydrogen bonds between one another; the chlorines on the carbon give the carbon a sufficient partial positive charge to enable this behavior:

A solution composed of an equal number of moles of acetone and chloroform has a vapor pressure of 250 torr at 35 ^oC. (a) What would be the vapor pressure of the solution if it exhibited ideal behavior? (b) Based on the behavior of the solution, predict whether the mixing of acetone and chloroform is an exothermic (ΔH_{soln <} 0) or endothermic (ΔH_soln >0) process.