The percentage by mass of nitrogen in urea, CO(NH2)2, is closest to (C = 12, H = 1, N = 14, O = 16)

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The percentage by mass of nitrogen in urea, $CO (NH X_{2}) X_{2}$ , is closest to (C = 12, H = 1, N = 14, O = 16)

Molar mass of urea = 12 + 16 + 2(14 + 2) = 60 g/mol. Each mole contains two N atoms, i.e. 28 g of N. Percentage = 28/60 x 100 = 46.67%.

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