Q.

A 5.25% solutions of a substance is isotonic with 1.5% solution of urea in the same solvent. If the densities of both the solutions are assumed to be equal to 1g cm-3 the molar mass of the substances will be

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a

115 g mol–1

b

105 g mol–1

c

210 mol–1

d

90 g mol–1

answer is C.

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Detailed Solution

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.When two solutions are isotonic, then, the osmotic pressure of one solution is equal to the osmotic pressure of the other,

 π1 ​= π2​

C1​ R T  =  C2​ R T

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