The vapour pressure of a solution of a non-volatile, non-electrolyte solute in a solvent is 95% of the vapour pressure of the pure solvent at the same temperature. If the molecular mass of the solvent

Question

The vapour pressure of a solution of a non-volatile, non-electrolyte solute in a solvent is 95% of the vapour pressure of the pure solvent at the same temperature. If the molecular mass of the solvent is 0.3 times that of solute, the mass ratio of solvent and solute is

Prashant Kotian · Accepted Answer

Correct answer: B. P/P° = X_solvent = 0.95. n_solute/n_solvent = 0.05/0.95 = 1/19. With M₁ = 0.3M₂: (w₂/w₁) × 0.3 = 1/19 → w₁/w₂ = 57/10.

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