Question

Calculate the percentage of nitrogen present in urea?

• A. 16.3
• B. 38.4
• C. 46.6
• D. 59.1

Answer 1

The correct option is C

46.6

The explanation for the correct answer:

Calculating percentage:

Number of atoms of nitrogen in urea (${\mathrm{NH}}_2{\mathrm{CONH}}_2$) = 2

Atomic mass of nitrogen = 14

Molecular mass of urea = 2 x Atomic Mass of N + 4 x Atomic Mass of H + Atomic Mass of C + Atomic Mass of O = 2 x 14 + 4 x 1 + 14 +16 = 60

So, the percentage of nitrogen present in urea = $\frac{2\mathrm{x}14}{60}x100$ = 46.6 %

Therefore, the percentage of nitrogen present in urea is 46.6%, option (C) is correct.