Vapour pressure of solution containing 6 g of a non-volatile solute in 180 g water is 20 torr. If 1 mole of water is further added, vapour pressure increases by 0.02 torr. The molar mass (in g/mol) of

Question

Vapour pressure of solution containing 6 g of a non-volatile solute in 180 g water is 20 torr. If 1 mole of water is further added, vapour pressure increases by 0.02 torr. The molar mass (in g/mol) of the non-volatile solute is

Prashant Kotian · Accepted Answer

Correct answer: 0054. Let M = molar mass, n = 6/M. Initially N = 10 mol water. P° × 10/(n+10) = 20. After adding 1 mol: P° × 11/(n+11) = 20.02. Dividing: 10(n+11)/[11(n+10)] = 20/20.02 → n = 1/9 → M = 54 g/mol.

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