[angelxstyl]

A solution consists of a mixture of benzene and toluene and is allowed to come to equilibrium with its vapor. The vapor is then condensed and found to contain 0.500 mole fraction of each component. Calculate the composition (mole fraction) of the toulene in the original solution. The vapor pressures of pure benzene and toulene at this temperature are 750. torr and 300. torr, respectively.

[Borek]

You just don't ask. You try, you tell us what you did, we push you in the right direction.

[angelxstyl]

i wasn't expecting anyone to solve it for me... i was hoping to get an explanation on how to get started. like, an equation or concept to use.

[Borek]

Raoult's law. But I don't believe you were told to solve the question not being taught anything first. And I don't believe there is nothing on the subject in the textbook.