A - benzene, B - Toluene
PT=PAoXA+PBoXB
=12.8×0.5+3.85×0.5
=6.2+1.925
=8.125
Also, mole fraction of benzene in vapour form
YA=PTPAoXA=8.1216.2=0.75
And mole fraction of Toluene in vapour form
YB=1−0.75=0.25
NEET UG 2016 — Chemistry Physical Chemistry
Which of the following statements about the composition of the vapour over an ideal 1 : 1 molar mixture of benzene and toluene is correct? Assume that the temperature is constant at 25oC . (Given vapour pressure data at 25oC , benzene = 12.8 kPa, toluene = 3.85 kPa)
Held on 30 Apr 2016 · Verified 9 Jul 2026.
The vapour will contain a higher percentage of benzene.
The vapour will contain a higher percentage of toluene.
The vapour will contain equal amounts of benzene and toluene.
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