Question

on complete combustion 0.246 gm of an organic compound gave 0.198 gm of carbon dioxide and 0.1014 gm of water. determine the percentage composition of carbon and hydrogen compound​

Answer 1

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Answer 2

CO₂ and H₂O produced are weighed by absorbing in concentrated solution of potassium hydroxide and anhydrous calcium chloride or magnesium perchlorate respectively,

$\sf\%C = \dfrac{12}{44} \times \dfrac{Weight \: of \: CO_2 \: formed}{weight \: of \: organic \: compound} \times 100$

According to the question,

Weight of CO₂ formed = 0.198gm

Weight of organic compound = 0.246 gm

By substituting the given values in the formula,

$\dashrightarrow \sf\%C = \dfrac{12}{44} \times \dfrac{0.198}{0.246} \times 100$

$\dashrightarrow \sf\%C = 21.95\%$

Similarly,

$\sf \%H = \dfrac{2}{18} \times \dfrac{Weight \: of \: H_2O \: formed}{weight \: of \: organic \: compound} \times 100$

According to the question,

Weight of H₂O formed = 0.1014gm

Weight of organic compound = 0.246 gm

By substituting the given values in the formula,

$\dashrightarrow \sf\% H= \dfrac{2}{18} \times \dfrac{0.1014}{0.246} \times 100$

$\dashrightarrow \sf\% H= 4.58\%$

Thus, the percentage composition of carbon and hydrogen compound are 21.95% and 4.58%