MHT CET 2024 Chemistry question
Vapour pressure of a pure solvent is 550 mm of Hg. By addition of a non-volatile solute it decreases to 510 mm of Hg. Calculate the mole fraction of solute in solution?
Answer: (B)
Solution
For a non-volatile solute, Raoult's law gives the relative lowering of vapour pressure equal to the mole fraction of solute: . Substituting, $ = = = 0.0727
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