[porousshield]

A solution (liquid) of heptane and hexane, at 69.0 degrees celsius, in which the mole fraction of hexane is 0.345. Assume that hexane and heptane form an ideal solution. Normal boiling point of hexane is 69.0 degrees celsius. Normal boiling point of heptane is 98.4 degrees celsius and the enthalpy of vaporization is 35.2 kJ/mol. (Assume an ideal solution).

I'm stuck on the first step.  I know how to do the problem when the kpa's are given since you just plug them in to Raoult's equation.

Do I have to use the Clausius-Clapeyron equation first?

[Borek]

Clausius-Clapeyron for heptane. Pressure for hexane is already known.