A sample of water in the vapor phase (no liquid present) in a flask of constant volume exerts a pressure of 257 mm Hg at 85 C. The flask is slowly cooled.
i) Assuming no condensation, use the Ideal Gas Law to calculate the pressure of the vapor at 71 C; at 68 C.
ii) Will condensation occur at 71 C; at 68 C? Explain.
iii) On the basis of your answers in i) and ii), predict the pressure exerted by the water vapor at 71 C; at 68 C.

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