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A vapor mixture of benzene and toluene is slowly cooled inside a constant volume vessel. Initially...

A vapor mixture of benzene and toluene is slowly cooled inside a constant
volume vessel. Initially the pressure inside the vessel is 300 mm Hg and the
temperature is 70 C. As the vessel is cooled, the pressure inside the vessel
decreases. Assume the vapor behaves like an ideal gas and take the dew point of
the mixture to be 60 C. What is the mole fraction of benzene in the initial vapor
mixture?

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