How do I find the total vapor pressure of a solution of benzene (mole fraction 0.350, vapor pressure at 25 degrees = 12.7 kPa) in toluene at 25 degrees. (vapor pressure of toluene at 25 degrees = 3.79 kPa)

Answer 1

Wouldnt you just multipy each vapor pressure x mole fraction of the component, then for total, add them up?

See Raoult's law of partial pressures.
http://en.wikipedia.org/wiki/Raoult's_law