0.5 g of an organic compound on combustion gave 1.46 g of $\mathrm{CO}_{2}$ and 0.9 g of $\mathrm{H}_{2}\mathrm{O}$. The percentage of carbon in the compound is _____. (Nearest integer) [Given : Molar mass (in $\mathrm{g} \mathrm{mol}^{-1}$ ) C: 12, H: 1, O : 16]

JEE Main · 2025 · 03 Apr 2025 · Shift 1 · Some Basic Concepts of Chemistry

0.5 g of an organic compound on combustion gave 1.46 g of

CO_{2}

and 0.9 g of

H_{2} O

. The percentage of carbon in the compound is _____. (Nearest integer)
[Given : Molar mass (in

g mol^{- 1}

) C: 12, H: 1, O : 16]

Answer: 80

Every carbon atom of the compound ends up in

CO_{2}

. Moles of

CO_{2} = \frac{1.46}{44}

, so the mass of carbon is

\frac{1.46}{44} \times 12 = 0.398

g. The carbon fraction is

\frac{0.398}{0.5} \times 100 = 79.6%

, which to the nearest integer gives a carbon percentage of

80

JEE Main · 2025 · 03 Apr 2025 · Shift 1 · Integer answer