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  • Complete combustion of 750 g of an organic compound provides 420 g of  and 210 g of .The percentage composition of carbon and hydrogen in organic co

Complete combustion of 750 g of an organic compound provides 420 g of CO_{2} and 210 g of H_{2}O.The percentage composition of carbon and hydrogen in organic compound is 15.3 and ______respectively. (Round off to the Nearest Integer).
 

Answers (2)

best_answer

44 \mathrm{g} \ \mathrm{CO}_{2} \text { have } 12 \mathrm{g} \text { carbon }

\mathrm{So}, 420 \mathrm{g }\ \mathrm{CO}_{2} \Rightarrow \frac{12}{44} \times 420

\\ \Rightarrow \frac{1260}{11} \mathrm{g} \text { carbon } \\\\ \Rightarrow 114.545 \text { gram carbon }

Alternative Method:

Liebig's method:

\begin{aligned} \% \text { of H-element }=& \frac{2}{18} \times \frac{\text { Mass of } \mathrm{H}_{2} \mathrm{O}}{\text { Mass of compound }} \times 100 \\ &=\frac{2}{18} \times \frac{210}{750} \times 100=3.11 \simeq 3 \end{aligned}

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