A synthesis gas at 500°C that analyzes 6.4% CO2, 0.2%O2, 40% CO, 50.8% H2, and the balance nitrogen is burnt with 40% dry excess air, which is at 25°C. The composition of the flue gas, which is at 720°C is 13% CO2, 14.3%H2O, 67.6% N2 and 5.1% O2. What was the heat transfer to or from the combustion process?