The Vapor Pressures of Pure Hexane and Pure Heptane at 25

Multiple Choice

The vapor pressures of pure hexane and pure heptane at 25 °C are 151.4 mmHg and 45.62 mmHg respectively.A solution contains 0.800 mol fraction n-hexane and 0.200 mol fraction n-heptane.What is the composition of the vapor in equilibrium with this solution at 25 °C?

A) 80.0% hexane,20.0% heptane
B) 50.0% hexane,50.0% heptane
C) 77.0% hexane,23.0% heptane
D) 45.0% hexane,55.0% heptane
E) 93.0% hexane,7.0% heptane