A solution contains a mixture of pentane and hexane at room temperature. The solution has a vapor pressure of 243torr . Pure pentane and hexane have vapor pressures of 425 torr and 151 torr,...

A solution contains a mixture of pentane and hexane at room temperature. The solution has a vapor pressure of 243torr . Pure pentane and hexane have vapor pressures of 425 torr and 151 torr, respectively, at room temperature.    What is the mole fraction of hexane? (Assume ideal behavior.)    Express the mole fraction to three decimal places.