Two liquids A and B have vapour pressures in the ratio PA°:PB° =1:3 at a certain temperature. Assuming that A

Two liquids A and B have vapour pressures in the ratio PA°:PB° =1:3 at a certain temperature. Assuming that A and B form an ideal solution and ratio of mole fractions of A and B in the vapour phase is 4 : 3 , then the mole fraction of A in the solution at the same temperature is :​

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