At 20 ° C , the vapour pressure of benzene is 70 torr and that of methyl benzene is 20 torr. The mole fraction of benzene in the vapour phase at 20 ° C above an equimolar mixture of benzene and methyl

Question

At 20 ° C , the vapour pressure of benzene is 70 torr and that of methyl benzene is 20 torr. The mole fraction of benzene in the vapour phase at 20 ° C above an equimolar mixture of benzene and methyl benzene is _ _ × 10 - 2 . (Nearest integer)

TestHub · Accepted Answer

P B ∘ = 70 P T ∘ = 20 X B = 0.5 = X T Now y B = X B P B ∘ X B P B o + X T P T ∘ = 70 × 0.5 70 × 0.5 + 20 × 0.5 = 78 × 10 - 2

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