Question

Mole fraction of toulene in it's 25% by mass solution with benzene.

Answer 1

A quantity of benzene, C6H6, and toluene, C6H5CH3, is placed in a 1 L evacuated vessel at 25 ∘C. At equilibrium, a small volume of liquid is visible at the bottom of the container. A sample of the vapour phase is analysed and found to contain 53 mol−% benzene. What is the mole fraction of benzene in the liquid phase?

Vapour pressures at 25 °C: benzene = 0.125 atm, toluene = 0.037 atm