Question

$0.2$ mole sample of hydrocarbon $C_{x}H_{y}$ yields after complete combustion with excess $O_{2}$ gas, $0.8\, mole$ of $CO_{2}$, $1.1\, mole$ of $H_{2}O$ Hence hydrocarbon is

• A. $C_{4}H_{10}$
• B. $C_{4}H_{8}$
• C. $C_{4}H_{5}$
• D. $C_{8}H_{16}$

Answer 1

Answer: (A)

$C_{x}H_{y}+O_{2} \rightarrow xCO_{2}+\frac{y}{2} H_{2}O$
$\begin{matrix}0.2&\\ 0&0.2x \frac{y}{2}\times0.2\end{matrix}$
given $0.2x = 8$
$\begin{matrix}x=4\\ 0.1y =0.1\\ y=10\end{matrix}$
$\therefore C_{4}H_{10}$