A liquid mixture of 20% by mole benzene and the rest 2 -propanol is in equilibrium with its vapor at 69C. Estimate the equilibrium pressure and the composition of the vapor phase. Assume the 1-parameter Margules equation holds. At this temperature, the vapor pressure of the benzene is 530 mmHg, and that of the 2-propanol is 434 mmHg. Note that the system does not form azeotrope at this temperature whose composition is 61% by mole benzene (at a pressure of 685mmHg). If you make up an assumption, please justify your assumptions based on results.

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