What are the approximate percentages by mass of nitrogen and hydrogen respectively in urea?
47% and 7%
Urea has the molecular formula CO(NH2)2, i.e. CH4N2O, with molar mass = 12 + 4(1) + 2(14) + 16 = 60 g/mol. Mass % of nitrogen = (28/60) × 100 ≈ 46.7% ≈ 47%. Mass % of hydrogen = (4/60) × 100 ≈ 6.7% ≈ 7%. Hence the approximate percentages are 47% and 7%.
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