Two liquids A and B form an ideal solution at temperature T K. At T K , the vapour pressures of pure A and B are 55 and 15 kNm –2 respectively. What is the mole fraction of A in solution of A and B in

Question

Two liquids A and B form an ideal solution at temperature T K. At T K , the vapour pressures of pure A and B are 55 and 15 kNm –2 respectively. What is the mole fraction of A in solution of A and B in equilibrium with a vapour in which the mole fraction of A is 0.8 ?

(A) 0.5217
(B) 0.480
(C) 0.663
(D) 0.340

Prashant Kotian · Accepted Answer

Correct answer: A. o A A A B B B Y P X . Y X P  A B X 0.8 0.2 X   A B X 12 X 11   A X  = 0.5217 ALLEN 

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