Chemistry Question from JEE Main 2023 · 25 January, Shift 2

$28.0 \, \text{L}$ of $\mathrm{CO_2}$ is produced on complete combustion of $16.8 \, \text{L}$ gaseous mixture of ethene and methane at $25^\circ \text{C}$ and $1 \, \text{atm}$. Heat evolved during the combustion process is _____ $\text{kJ}$.

Given: $\Delta H_c(\mathrm{CH_4}) = -900 \, \text{kJ/mol}$ $\Delta H_c(\mathrm{C_2H_4}) = -1400 \, \text{kJ/mol}$