Question

Amount of oxygen required for combustion of $1$kg of a mixture of butane and isobutane is:

• A. $1.8$ kg
• B. $2.7$ kg
• C. $4.5$ kg
• D. $3.58$ kg

Answer 1

The correct option is D $3.58$ kg

Butane and isobutane has the same molecular formula $C_4{H}_{1}0$

$C_4{H}_{10}+\frac{13}{2}{O}_2\to 4C{O}_2+5H_{2}O$

58g of $C_4{H}_{10}$ requires $O_2$ = $\frac{13}{2}\times 32$

1000g of $C_4{H}_{10}$ requires $O_2$ = $\frac{13\times 32\times 1000}{2\times 58}$

= 3.586 Kg