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A mixture of 20 g water and 80 g ethanol is in equilibrium with is vapor...

A mixture of 20 g water and 80 g ethanol is in equilibrium with is vapor at 19°C. What is the system pressure (in mm Hg) and the composition (in mol%) of the vapor?

Data:     pwater*(19°C) = 16.6 mm Hg; pethanol*(19°C) = 40.0 mm Hg

              Mwater = 18.02; Methanol = 46.08

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