A sample of water in the vapor phase (no liquid present) in a flask of constant volume exerts a pressure of 263 mm Hg at 90 C. The flask is slowly cooled.
i) Assuming no condensation, use the Ideal Gas Law to calculate the pressure of the vapor at 77 C; at 73 C.
ii) Will condensation occur at 77 C; at 73 C? Explain.
iii) On the basis of your answers in i) and ii), predict the pressure exerted by the water vapor at 77 C; at 73 C.

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