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 pAo and pBo are (in torr)

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254, 119

119, 254

135, 254

119, 373

answer is C.

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Detailed Solution

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

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