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  4. Equal moles of water and urea are taken in a flask. What is mass percentage of urea in the solution ?

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Q. Equal moles of water and urea are taken in a flask. What is mass percentage of urea in the solution ?

UPSEEUPSEE 2006

Solution:

If $H_2O = x \, mol = 18 \,x\,g$
then urea $ = x\, mol = 60\, x\, g $
Total mass of the solution
$ = 18 x + 60 x = 78 x \, g$
Mass $\%$ of urea $ =\frac{18x}{78x} × 100 = 23 . 077 \%$