A solution is made by mixing 50.0 g acetone (CH3COCH3) and 50.0 g methanol (CH3OH). What is the composition of the vapor expressed as a mole fraction? What is the vapor pressure of this solution at 25C? Assume ideal solution and gas behavior. (At 25C the vapor pressures of pure acetone and methanol are 271 and 143 torr, respectively).