Upon combustion, a $30 g$ sample of a compound containing only carbon, hydrogen, and oxygen produces $44.0 g$ of carbon dioxide and $18.0 g$ of water.Find the empirical formula of the compound.

C H O

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C_{2} H O_{2}

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C H_{2} O_{2}

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C H_{2} O

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Solution

The correct option is C $C H_{2} O$
$C_{x} H_{y} O_{z} + O_{2} \to C O_{2} + H_{2} O$
$44 g$ $18 g$
No. of moles of $C O_{2}$ produced $= \frac{44}{44} = 1 m o l e$
No. of moles of $H_{2} O$ produced $= \frac{18}{18} = 1 m o l e$
$\Rightarrow$ No. of carbon $x = 1;$ No. of hydrogen $y = 2.$
No. of oxygen $= 3$
$\Rightarrow z = 1.$
So, the empirical formula is $(C H_{2} O)$

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