Solutions of Benzene and Toluene Obey Raoult's Law

Multiple Choice

Solutions of benzene and toluene obey Raoult's law.The vapor pressures at 20°C are: benzene,76 torr;toluene,21 torr.
-A benzene-toluene solution is allowed to come to equilibrium with its vapor.The vapor is then condensed and found to contain 50.0 mole percent of each component.Calculate the composition (mole percent) of the original solution.The vapor pressures of pure benzene and toluene at this temperature are: 750.torr and 300.torr,respectively.

A) 50.2% benzene
B) 28.6% benzene
C) 71.0% benzene
D) 40.0% benzene
E) none of these