What is the mass percentage of carbon in urea? (mol. mass of urea $=60 \mathrm{~g} \mathrm{~mol}^{-1}$ )

What is the mass percentage of carbon in urea? (mol. mass of urea $=60 \mathrm{~g} \mathrm{~mol}^{-1}$ )
  1. $28 \cdot 0 \%$
  2. $20 \cdot 0 \%$
  3. $26.67 \%$
  4. $46.67 \%$

Solution

The molecular formula of Urea is: We know, Mass percentage of carbon in urea $=\frac{\text { Molar mass of carbon }}{\text { molar mass of urea }} \times 100$ Thus, the molar mass of Ureas $=4 \times 1+12+2 \times 14+16=60$ $\therefore$ Mass percentage of Carbon in Ureas $=\frac{12}{60} \times 100=20 \%$ Hence, option A is correct.

Asked in: MHT CET 2020 (14 Oct Shift 1)

Practice more Some Basic Concepts of Chemistry questions on Aicharya