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OJEE Molar Mass from Vapour Pressure Lowering — practice questions

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A solution of 394 g of a non-volatile solute in 622 g of water has vapour pressure 30.74 mm Hg at 30 °C. The v2.315 g of a non-volatile solute is dissolved in 49 g of benzene (M = 78 g/mol). The vapour pressure of pure b