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On dissolving 0.5 g of a non-volatile non-ionic solute in 39 g of benzene, its vapour pressure decreases from 650 mm of Hg to 640 mm of Hg. The depression in freezing point of benzene (in K) upon addition of the solute is: ( Given: The molar mass and the molal freezing point depression constant for benzene are 78 g mol1 and 5.12KKgmol1, respectively

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Solution

p0psps=i(nsolutensolvent)650640640=1×0.5×78M×39Msolute=64 gΔTf=Kf×molality=5.12×0.5×100064×39ΔTf=1.02 K

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