What is the total vapor pressure4 at 20° C of a liquid solution containing 0.30 mole fraction benzene, C6H6, and 0.70 mole fraction toluene, C6H5CH3? Assume that Raoult's law holds for each component of the solution. The vapor pressure of pure benzene at 20° C is 75 mmHg; that of toluene at 20° C is 22 mmHg. Express your answer in mmHg.