Question

Complete combustion of $750$g of an organic compound provides $420$ $\mathrm{g}$ of ${\mathrm{CO}}_2$ and $210$ $\mathrm{g}$ of ${\mathrm{H}}_2\mathrm{O}$. The percentage composition of carbon and hydrogen in organic compounds is $15.3$ and _______ respectively. (Round off to the Nearest Integer).

Answer 1

1. Combustion is a chemical process in which a substance reacts rapidly with oxygen and gives off heat.

2. Liebig's method is used for the estimation of carbon and hydrogen in which we heat a known mass of organic compound in the presence of pure oxygen

3. % of H-element =$\frac{2}{18}\times \frac{massofwater}{massofcompound}\times 100$

=$\frac{2}{18}\times \frac{210}{750}\times 100$

=$3.11\simeq 3$

Therefore, The percentage composition of carbon and hydrogen in organic compounds is $15.3$ and $3$ respectively.