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.