Question

What volume of oxygen gas $\left(O_2\right)$ measured at $0^0$C and 1 atm, is needed to burn completely 1L, of propane gas $\left(C_3{H}_8\right)$ measured under the same conditions?

• A. 5 L
• B. 10 L
• C. 7 L
• D. 6 L

Answer 1

The correct option is A 5 L

$C_3{H}_8+5O_2⟶3C{O}_2+4H_{2}O$

mole ratio for $C_3{H}_8:O_2=1:5$

$\therefore$ Volume ratio $=$ mole ratio $=1:5$

$\therefore$ For complete combustion of $1L$ of $C_3{H}_8,$ 5L $O_2$ is required.