A 25 C the vapor pressure of n-pentane (C5H12) is 511 torr and the vapor pressure of n-hexane (C6H14) is 145 torr. If a solution is made from 100 g of pentane and 100 g of hexane, what will be the mole fraction of pentane in the gas phase over that solution (if only hexane and pentane vapor are present)? Assume no deviation from Raoult's law