Chemistry - Mole Concept Question with Solution | TestHub

Combustion reaction.

${\mathrm{C}}_{\mathrm{x}}{\mathrm{H}}_{\mathrm{y}\left(\mathrm{g}\right)}+\left(\mathrm{x}+\frac{\mathrm{y}}{4}\right){\mathrm{O}}_2\left(\mathrm{g}\right)\to {\mathrm{xCO}}_2\left(\mathrm{g}\right)+\frac{\mathrm{y}}{2}{\mathrm{H}}_2\mathrm{O}\left(\mathrm{\ell }\right)$

$\begin{array}{ccc}\mathrm{V}& 6 \mathrm{V}& -\\ -& -& \mathrm{Vx}=4\mathrm{V}\end{array}$

$\Rightarrow \mathrm{x}=4$

Since: $\left(\mathrm{I}\right) {\mathrm{Vo}}_2=6\times {\mathrm{V}}_{{\mathrm{C}}_{\mathrm{x}}{\mathrm{H}}_{\mathrm{y}}}$

$\Rightarrow \mathrm{V}\left(\mathrm{x}+\frac{\mathrm{y}}{4}\right)=6 \mathrm{V}$

$\Rightarrow \left(\mathrm{x}+\frac{\mathrm{y}}{4}\right)=6\Rightarrow 4+\frac{\mathrm{y}}{4}=6$

$\Rightarrow \mathrm{y}=8$