Q.

A 5.25% solution of a substance is isotonic with a 1.5% solution of rea (molar mass = 60 g mol-1) in the same solvent. If the densities of both the solutions are assumed to be equal to 1.0 g cm-3, molar mass of the substance will be :

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answer is 4.

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Detailed Solution

Solution with the same osmotic pressure are isotonic Let the molar mass of the substance be M π1=π2C1RT=C2RTC1=C2w1m11000V1in ml= w2m21000V2in mlV1=V2=100mlSo, 5.25M=1.560∴ M=5.25×601.5=210

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