A solution containing 8.6 g urea in 1 L was found to be isotonic with a 5% (weight/volume) 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-electrolyte solutions, if isotonic C1= C2. ∴ 8.660×1=5×1000Mw2×100⇒Mw2=348.9

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