Benzene,C₆H₆,and Toluene,C₆H₅CH₃,form Ideal Solutions

Multiple Choice

Benzene,C₆H₆,and toluene,C₆H₅CH₃,form ideal solutions.At 35°C the vapor pressure of benzene is 160.torr and that of toluene is 50.0 torr.In an experiment,3.9 mol of benzene and 5.7 mol of toluene are placed in a closed container at 35°C and allowed to come to equilibrium.What is the mole fraction of toluene in the vapor phase?

A) 0.52
B) 0.69
C) 0.31
D) 0.12
E) 0.60