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Based on the Type of Solvent

Aqueous Urea ...

Question

Aqueous Urea solution is 20% by mass of solution. Calculate percentage by mass of solvent.

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Solution

Let the mass of the solution be 100gm
So mass of urea is 20% of 100,so mass of urea is 20 gm
So mass of water = 100 – 20
= 80gm
So mass of urea by solvent(water) = 20/80 x 100%
= 25%

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