Question

How much water should be added to 20 gram urea to make 20% urea solution ?

Answer 1

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 X 100

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80

= 25%

so the answer is 25%