Question

If a mixture of isobutane and n-butane are present in a gas, then calculate the mass of oxygen required for complete combustion of $5$ $kg$ of this gas

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

Answer 1

Answer: (C)

Isobutane and n-butane $\left[C_{4} H_{10}\right]$ have same molecular formula; $C_{4}H_{10}+\frac{13}{2}O_{2} \rightarrow 4CO_{2}+5H_{2}O$

For $58$ $gm$ of $C_{4}H_{10}$ $208gm$ $O_{2}$ is required then for $5kg$ of $C_{4}H_{10}$ $O_{2}=\frac{5 \times 208}{58}=17.9 \, kg$