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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 isGiven: Saturation vapour pressure of benzene = 120 torr, Saturation vapour pressure of toluene = 80 torr

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a

0.5

b

0.25

c

0.6

d

0.4

answer is D.

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Detailed Solution

Total vapour pressure                                   =12×120+12×80=100 torryA×100=xApAo  as per Raoult's law or yA=12×80100=0.4yA = mole fraction of Toluene in vapour phase.
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Mole fraction of toluene in the vapour which is in equilibrium with a solution containing benzene and toluene having 2 moles each isGiven: Saturation vapour pressure of benzene = 120 torr, Saturation vapour pressure of toluene = 80 torr