A solution containing 8.6 g urea in one litre was found to be isotonic with a 5% (wt./vol.) solution of an organic non-volatile solute. The molecular weight of latter is :

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348.9

34.89

3489

861.2

answer is A.

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Detailed Solution

For two non-electrolytic solutions if isotonic C1=C2∴ 8.660×1=5×1000m×100 ∴ m=348.9

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