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A solution containing 8.6g urea in one l...

A solution containing `8.6g` urea in one litre was found to be isotonic with `0.5%` (wt/vol.) solution of an organic, non-volatile solution. The molecular weight of latter is

A

861.2

B

3489

C

34.89

D

348.9

Text Solution

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The correct Answer is:
D
No .of moles of urea = 8.6/60
5% of unknown solutions = 5 g / 100 m l
50 g / 1000 m l
No. of moles of unknown solute = 50 /m
8 . 6 / 60 = 50 / m
` m ( 50 xx 60) // 8 . 6 `
`m = 348 . 9 (349) `
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