Question

Calculate the mass of urea required to make 250 g of 25% (w/W) aqueous solution of urea.
(A) 50 g
(B) 200 g
(C) 62.5 g
(D) None of these

Answer 1

25% sol of urea equals 25g urea in 100g water
Mass= 250*25/100 = 62.5g
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