10 ~mL of gaseous hydrocarbon on combustion gives 40 ~mL of CO_2(… - Vidyadip

MCQ

$10 \mathrm{~mL}$ of gaseous hydrocarbon on combustion gives $40 \mathrm{~mL}$ of $\mathrm{CO}_2(\mathrm{~g})$ and $50 \mathrm{~mL}$ of water vapour. Total number of carbon and hydrogen atoms in the hydrocarbon is........................

A
$20$
✓
$14$
C
$30$
D
$13$

✓

Answer

Correct option: B.

$14$

b
$\mathrm{CxHy}$ $(10 \mathrm{ml})$$+\mathrm{O}_2 \rightarrow \mathrm{CO}_2+\mathrm{H}_2 \mathrm{O}$

$\mathrm{CxHy}+\left(\mathrm{x}+\frac{\mathrm{y}}{4}\right) \mathrm{O}_2 \rightarrow \mathrm{xCO}_2+\frac{\mathrm{y}}{2} \mathrm{H}_2 \mathrm{O}$

$\text { 10x } 5 \mathrm{y}$

$10 x=40$

$\mathrm{x}=4$

$5 y=50$

$\mathrm{y}=10$

$\mathrm{C}_4 \mathrm{H}_{10}$

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