At 20 oC the vapor pressure of benzene (C6H6) is

At 20 oC the vapor pressure of benzene (C6H6) is 75 torr, and that of toluene (C7H8) is 22 torr. Assume that benzene and toluene form an ideal solution.
(a) What is the composition in mole fractions of a solution that has a vapor pressure of 35 torr at 20 oC?
(b) What is the mole fraction of benzene in the vapor above the solution described in part (a)?

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