Question

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

• A. $5L$
• B. $10L$
• C. $7L$
• D. $6L$

Answer 1

The correct option is A $5L$

The balanced chemical equation for the complete combustion of propane is given as :
$C_3{H}_8\left(g\right)+5O_2\left(g\right)\to 3C{O}_2\left(g\right)+4H_{2}O$
Hence, as per the Gay lussac's law, volume of oxygen gas measured at $0^{\circ }C$ and 1 atm needed to burn compeletely $1L$ of propane gas $\left(C_3{H}_8\right)$ under the same conditions is $5L$.

Hence the correct answer is option (a).