The vapour pressure of a solvent is 20 torr whereas that of its dilute solution is...

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The vapour pressure of a solvent is 20 torr whereas that of its dilute solution is 17 torr. The mole fraction of the solvent is (a) 0.6 (b) 0.4 (c) 0.85 (d) 0.7 The vapour pressure of a solvent is 20 torr whereas that of its dilute solution is 17 torr. The mole fraction of the solvent is (a) 0.6 (b) 0.4 (c) 0.85 (d) 0.7