JEE Main 2022 — Some Basic Concepts Of Chemistry Question with Solution

$$C_x{H}_y+\left(x+\frac{y}{4}\right)O_2\to xC{O}_2+\frac{y}{2}{H}_{2}O$$

Given organic compound C_xH_y= 0.3 gm

Produced carbon dioxide (CO₂) = 0.2 gm

Produced water (H₂O) = 0.1 gm

Moles of CO₂ = $$\frac{0.2}{44}$$

$$\therefore$$ Moles of C atom = $$\frac{0.2}{44}$$

$$\therefore$$ Mass of C atom = $$\frac{0.2}{44}$$ $$\times$$ 12 = 0.0545

Moles of H₂O = $$\frac{0.1}{18}$$

$$\therefore$$ Moles of H atoms = $$\frac{0.1}{18}$$ $$\times$$ 2

$$\therefore$$ Mass of H atoms = $$\frac{0.1\times 2}{18}$$ $$\times$$ 1 = 0.0111

$$\therefore$$ % of C atom = $$\frac{0.0545}{0.3}$$ $$\times$$ 100 = 18%