Vapour pressure of pure 'A' is 70 ~mm of Hg at 25^ C . It forms an ideal solution with ' B ' in which mole fraction of A is 0.8 . If the vapour pressure of the solution is 84 ~mm of Hg at 25^ C , the vapour pressure of pure ' B ' at 25^ C i

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Vapour pressure of pure 'A' is 70 ~mm of Hg at 25^ C . It forms an ideal solution with ' B ' in which mole fraction of A is 0.8 . If the vapour pressure of the solution is 84 ~mm of Hg at 25^ C , the vapour pressure of pure ' B ' at 25^ C is

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Correct answer: D. 140 ~mm

p = p _ A ^ x _ A + p _ B ^ x _ B 84=70 0.8+ p _ B ^ 0.284=56+ p _ B ^ 0.2 p _ B ^ = 28 0.2 =140 ~mm

Vapour pressure of pure 'A' is 70 ~mm of Hg at 25^ C . It forms an ideal solution with ' B ' in which mole fraction of A is 0.8 . If the vapour pressure of the solution is 84 ~mm of Hg at 25^ C , the vapour pressure of pure ' B ' at 25^ C is

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