$13\mathrm{.}44$ Methane $($CH$4)$ at $25$C$,1$ atm enters an insulated reactor operating

at steady state and burns with the theoretical amount of air

entering at $25$C$,1$ atm. Determine the temperature of the exiting

combustion products, in K$,$ if $90\%$ of the carbon in the fuel burns to

CO$2$ and the rest to CO$.$ Neglect kinetic and potential energy effects.