At 20.0°C, the vapour pressure of pure benzene (C6H6) is 75.0 torr and that
of pure toluene (C7H8) is 22.0 torr. Assume that benzene and toluene form
an ideal solution.
2.1.1 Calculate the composition in mole fractions of a solution that has a vapor
pressure of 40.0 torr at 20.0°C. (8)
2.1.2 Calculate the mole fraction of benzene in the vapor above the solution at
63.5°C.
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