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 15kNm−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 ?
Held on 24 Jan 2026 · Verified 6 Jul 2026.
0.340
0.663
0.5217
0.480
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