200 mol/s of methane gas

and 60% excess oxygen at 25°C and 1 atm is fed to a furnace and partial

combustion occurs in the furnace. The product stream at 25°C and 1 atm

discharges from the furnace. 200 mol/s water liquid is produced from the

combustion. By using the information from the Important Appendix, determine the

standard heat of reaction.