On complete combustion, 0.3 g of an organic compound gave 0.2 g of and 0.1 g of . The percentage composition of carbon and hydrogen in the compound respectively is [2024]

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Solution

Q.
On complete combustion, 0.3 g of an organic compound gave 0.2 g of ${CO}_{2}$ and 0.1 g of $H_{2} O$ . The percentage composition of carbon and hydrogen in the compound respectively is [2024]

1 4.07% and 15.02%

2 18.18% and 3.70%

3 15.02% and 4.07%

4 3.70% and 18.18%

Ans.
(2)

$% of C = \frac{12}{44} \times \frac{{Mass of CO}_{2} formed}{Mass of compound taken} \times 100$

$= \frac{12 \times 0.2 \times 100}{44 \times 0.3} = 18.18 %$

$% of H = \frac{2}{18} \times \frac{{Mass of H}_{2} O formed}{Mass of compound taken} \times 100$

$= \frac{2 \times 0.1 \times 100}{18 \times 0.3} = 3.70 %$

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