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At 60C vapor pressure of methanol and water are 84.562kpa and 19.953kpa respectively. An aqueous solution of methanol at 60C exerts a pressure of 39.223kpa; the liquid phase and vapor phase mole fraction of methanol are 0.1686 and 0.5714 respectively. Activity coefficient of methanol is: a) 1.572 b) 1.9398 c) 3.389 d) 4.238