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Liquid A and B form ideal solution for all compositions of A and B at 25C. Two such solutions with 0.25 and 0.50 mole

Liquid A and B form ideal solution for all compositions of A and B at 25C. Two such solutions with 0.25 and 0.50 mole fractions of A have the total vapour pressures of 0.3 and 0.4 bar, respectively. What is the vapour pressure of pure liquid B in bar?

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