posted by Anonymous .
The vapor pressure of an organic solvent is 50 mm Hg at 25°C and 200 mm Hg at 45°C. The solvent is
the only species in a closed flask at 35°C and is present in both liquid and vapor states. the system pressure is 760mmHg. Determine the
mole fraction of solvent in the gas phase.
I would use the Clausius-Clapeyron equation and solve for delta Hvap. Using that number, then solve for vapor pressure of the organic solvent at 35C (again using the CC equation). Then mole fraction = Psolvent/Ptotal.