Chemistry - Eudiometry Question with Solution | TestHub

A gas mixture containing hydrocarbon ${\mathrm{C}}_{\mathrm{x}}{\mathrm{H}}_{12}(\mathrm{g})$ and ${\mathrm{O}}_2(\mathrm{g})$ were taken in a closed rigid flask at 400 K . When sparked, they reacted to form ${\mathrm{CO}}_2(\mathrm{g})$ and ${\mathrm{H}}_2\mathrm{O}(\mathrm{g})$ and no reactants were left after the reaction. The pressure in the flask increased by $20\%$. The value of ' x ' is :