Mole ConceptHard

Question

At 300 K, the vapour pressure of an ideal solution containing 3 mole of A and 2 mole of B is 600 torr. At the same temperature, if 1.5 mole of A & 0.5 mole of C (non-volatile) are added to this solution the vapour pressure of solution increases by 30 torr. Then

Options

A.PBo = 1030
B.PAo = 940
C.PAo = 1410
D.PBo = 90

Solution

PoAxA + PoBxB
600 = PoA + PoB ; 3PoA + 2PoB = 3000
& 630 = PoA + PoB
1.5 PoA = 1410 ; PoA = 940 & PoB = 90

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