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At 63.5°C, the vapor pressure of H2O is 175 torr, and that of ethanol, C2H5OH, is 400 torr. A solution is made by mixing equal masses of H2O and C2H5OH. (a) What is the mole fraction of ethanol in the solution? (b) Assuming ideal-solution behaviour, what is the vapor pressure of the solution at 63.5°C? (c) What is the mole fraction of ethanol in the vapor above the solution?

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