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Question

Liquids A and B form ideal solution over the entire range of composition. At temperature T, equimolar binary solution of liquids A and B has a vapour pressure of 45 Torr. At the same temperature, a new solution of A and B having mole fractions xA and xB, respectively, has a vapour pressure of 22.5 Torr. The value of xAxB in the new solution is. (given that the vapour pressure of pure liquid A is 20 Torr at temperature T)

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Solution

XA=12,XB=12
PT=P0A×12+P0B×12
(Given P0A=20)
90=45×2=P0A+P0B.....(1)
P0B=9020=70
22.5=p0AXA+P0B(1XA)
=20XA+70(1XA)
22.5=20XA+7070XA=7050XA
XA=47.550=1920
XB=120
XAXB=1920120=19

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