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At 80C, pure liquid A has a vapour pressure of 0.921atm and pure liquid B has...

At 80C, pure liquid A has a vapour pressure of 0.921atm and pure liquid B has a vapour pressure of 1.24atm. What mole fraction of A (Xa) is needed to make a solution of A and B with a normal boiling point (at 1atm) of 80C?

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