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Question

Mixture of volatile components A and B has total vapour pressure (in Torr) p = 254 - 119 xA where xA is mole fraction of A in mixture. Hence P0A and P0B are (in Torr)

Options

A.254, 119
B.119, 254
C.135, 254
D.119, 373

Solution

P = XAPA0 + XBPB0 = (PA0 - PB0)XA + PB0
So    PB0 = 254
PA0 - PB0 = -119        PA0 = 135

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