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%