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Massa zat terlarut urea = 30 gram
Massa pelarut air = 45 gram
Mr urea = 60
Mr air = 18
Jika yang dimaksud adalah kadar, maka
{ [massa urea] / [massa urea + massa air] } x 100%
= [³⁰/₍₃₀₊₄₅₎ ] x 100%
= ³⁰/₇₅ x 100%
= 40%