Benzene and toluene forms nearly ideal solution. At 20 0 C , the vapour pressure of benzene is 75 torr and that of toluene is 22 torr. The partial vapour pressure (in torr) of benzene, at 20 0 C for a solution containing 78 g of benzene and 46 g of toulene, is

Question

Benzene and toluene forms nearly ideal solution. At 20 0 C , the vapour pressure of benzene is 75 torr and that of toluene is 22 torr. The partial vapour pressure (in torr) of benzene, at 20 0 C for a solution containing 78 g of benzene and 46 g of toulene, is, 50, 25, 37.5, 53.5

MARKS App · Accepted Answer

Let the number of moles of benzene be n A and that of toluene be n B . n A + n B = 78 78 + 46 92 = 1 + 0.5 P A = P A 0 X A = P A 0 ( n A n A + n B ) P A = P A 0 × 1 1 . 5 = 75 1 . 5 = 50 The partial vapour pressure (in torr) of benzene, at 20 0 C for a solution containing 78 g of benzene and 46 g of toulene, is 50 torr.

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