In a furnace, 8000 m3 /h are burned, measured under standard conditions, of a dry gas with the following composition (by volume): 55% CH4, 5% C2H6, 10% H2, 10% CO, 5% O2, 10% N2 and 5% CO2. Combustion is carried out with 20% excess enriched air, decomposition (by volume): 40% O2 and 60% N2. Air is fed at 1 atm pressure and 80 C. The combustion products leave the furnace at 1 atm and 200 C, with a content of CO2 and CO in a 7/1 molar ratio. Knowing that there is no H2, CH4 and C2H6 in the exit gas, calculate: 1. The ratio between the m3 of enriched air supplied and the m3 of flue gases produced. 2. The flue gas dew point temperature in