Question

In an auto engine with no pollution controls, about 5% of the fuel $\left(C_8{H}_{18}\right)$ is unburned. Molar ratio of $CO$ and $\left(C_8{H}_{18}\right)$, emitted in the exhaust gas is:

• A. 100
• B. 152
• C. 50
• D. 5

Answer 1

The correct option is B 152

The combustion taking place can be represented as

$C_8{H}_{18}+\frac{17}{2}{O}_2\to 8CO+9H_{2}O$

Since 0.05 moles of the fuel is unreacted, only 0.95 moles of the fuel will participate in combustion

Hence moles of $CO$ produced$=0.95\times 8=7.6$

Therefore, molar ratio$=\frac{7.6}{0.05}=152$

Hence, B is the correct answer