Vapour pressure of and are 540 mm Hg and 402 mm Hg respectively

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Problem

Vapour pressure of CH3Cl\text{CH}_3\text{Cl} and CH2Cl2\text{CH}_2\text{Cl}_2 are 540 mm Hg and 402 mm Hg respectively. 101 g of CH3Cl\text{CH}_3\text{Cl} and 85 g of CH2Cl2\text{CH}_2\text{Cl}_2 are mixed together. Determine: (1) The pressure at which the solution starts boiling. (2) Molar ratio of solute v/s solvent in vapour phase in equilibrium with solution.

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