Question

If isobutane and n-butane are present in a gas, then how much oxygen should be required for complete combustion of 5 kg of this gas

• A. 17.9 kg
• B. 9 kg
• C. 27 kg
• D. 1.8 kg

Answer 1

The correct option is A 17.9 kg

Isobutane and n-butane $\left[C_4{H}_{10}\right]$ have same molecular formula; $C_4{H}_{10}+\frac{13}{2}{O}_2\to 4C{O}_2+5H_{2}O$
For 58gm of $C_4{H}_{10}$ 208 gm $O_2$ is required then for 5 kg of
$C_4{H}_{10}{O}_2=\frac{5\times 208}{58}=17.9kg$