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Two liquids A and B form an ideal solution at temperature T. When the total vapour pressure above the solution is 400 torr, the

Two liquids A and B form an ideal solution at temperature T. When the total vapour pressure above the solution is 400 torr, the mole fraction of A in the vapour phase is 0.40 and in the liquid phase 0.75. What are the vapour pressure of pure A and pure B at temperature T?

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