On complete combustion, 0.492 g of an organic compound gave 0.792 g of CO$$_2$$. The % of carbon in the organic compound is (Nearest integer)

On complete combustion, the organic compound produces CO$$_2$$. The carbon in CO$$_2$$ comes entirely from the organic compound.

Mass of CO$$_2$$ produced = 0.792 g

Mass of carbon in CO$$_2$$:

$$ \text{Mass of C} = \frac{12}{44} \times 0.792 = \frac{12 \times 0.792}{44} = \frac{9.504}{44} = 0.216 \text{ g} $$

Percentage of carbon in the organic compound:

$$ \% C = \frac{0.216}{0.492} \times 100 = 43.9\% \approx 44\% $$