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Q.

Liquids A and B form an ideal solution. At $50^{0} C$ , the total vapour pressure of a solution containing 1 mole of A and 2 moles of ‘B’ is 300 mm Hg. When 1 mole of ‘A’ is added to the solution the total vapour pressure increases to 400 mm Hg. Then vapour pressure of pure ‘B’ is ____mm Hg

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answer is 100.

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Detailed Solution

$300 = \frac{1}{3} P^{0} A + \frac{2}{3} P^{0} B On solving P^{0} A = 700, P^{0} B = 100$

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Liquids A and B form an ideal solution. At 500C , the total vapour pressure of a solution containing 1 mole of A and 2 moles of ‘B’ is 300 mm Hg. When 1 mole of ‘A’ is added to the solution the total vapour pressure increases to 400 mm Hg. Then vapour pressure of pure ‘B’ is ____mm Hg