A sample of water in the vapor phase (no liquid present) in a flask of constant volume exerts a pressure of 309 mm Hg at 93 C. The flask is slowly cooled.
i) Assuming no condensation, use the Ideal Gas Law to calculate the pressure of the vapor at 78 C; at 70 C.
ii) Will condensation occur at 78 C; at 70 C? Explain.
iii) On the basis of your answers in i) and ii), predict the pressure exerted by the water vapor at 78 C; at 70 C.

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