Pure water vapour is trapped in a vessel of volume 25 ml. The relative humidity is 20%. The vapour is compressed slowly and isothermally. The volume of vapour (in ml) at which the first drop of liquid

Question

Pure water vapour is trapped in a vessel of volume 25 ml. The relative humidity is 20%. The vapour is compressed slowly and isothermally. The volume of vapour (in ml) at which the first drop of liquid will form, is

TestHub · Accepted Answer

Vapour pressure = 0.20 x pₛat. Isothermal compression raises the pressure until it equals pₛat. 0.20 pₛat x 25 = pₛat x V ⇒ V = 5 ml.

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