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Q.

Mole fraction of toluene in the vapour which is in equilibrium with a solution containing benzene and toluene having 2 moles each is, when vapour pressure of pure benzene and toluene are 120 torr and 80 torr respectively

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a

0.6

b

0.25

c

0.5

d

0.4

answer is C.

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Detailed Solution

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Mole fraction of Toluene in vapour phase = YToluene =P0XToluene /P0Xbenzene +P0XToluene 

Ytoluene=80×24120×24+80×24=4060+40=0.4

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