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A volume Vi = 23.1 L of air at temperature T = 21 ¢XC is compressed at constant temperature to a volume Vf = 7.7 L. The relative humidity of the air before compression is R = 56.4 %. Saturated water vapour in air at this temperature has a vapour pressure vp = 2.5 kPa and a density of £l = 18.4 g.m−3
a)What is the density the water vapour would have had following compression if it behaved like an ideal gas instead of experiencing partial condensation?
b) What mass of water condenses out because of the compression?

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