A sample of water in the vapor phase (no liquid present) in a flask of constant volume
exerts a pressure of 286 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 65 °C.
ii) Will condensation occur at 71 °C; at 65 °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 65 °C.
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