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MHT CET Chemistry question

ChemistrySolutionsMHT CET

The vapour pressure of a solvent decreased by 10 mm of mercury when a non-volatile solute was added to the solvent. The mole fraction of the solute in the solution is 0.2. What should be the mole fraction of the solvent, if the decrease in the vapour pressure is to be 20 mm of mercury?

Answer: (B)

Solution

, so doubling the lowering doubles the solute mole fraction to 0.4 and the solvent mole fraction

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Question ID VK-060861