When 5 litres of a gas mixture of methane and propane is perfectly combusted at 0°C and 1 atmosphere, 16 litre of oxygen at the same temperature and pressure is consumed. The amount of heat released from this combustion in KJ  $\left({\mathrm{\Delta H}}_{\text{comb }}\left({\mathrm{CH}}_4\right)=890{\mathrm{kJmol}}^{-1}\right)$$\left({\mathrm{\Delta H}}_{\text{comb }}\left({\mathrm{C}}_3{\mathrm{H}}_8\right)=2220{\mathrm{kJmol}}^{-1}\right)$ is