A constant-volume tank contains a mixture of 1 lb mol of benzene (C6H6) gas and 30 percent excess air at 77°F and 1 atm. The contents of the tank are now ignited, and all the hydrogen in the fuel burns to H2O but only 92 percent of the carbon burns to CO2, the remaining 8 percent forming CO. If the final temperature in the tank is 1800 R, determine the heat transfer from the combustion chamber during this process. Answer: 946,870 Btu