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Question

At 80C the vapour pressure of pure liquid ‘A’ is 520 mm of Hg and that of pure liq ‘B’ is 1000 mm of Hg. If the mixture of both liquids from an ideal solution and boils at 80C and 1 atm pressure, the mole fraction of ‘A’ in the liquid mixture is:

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Solution

PAXA+PBXB=Pmix(520)XA+(1000)(1XA)=760520XA1000XA=7601000480XA=240XA=12=0.5

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