A fuel consists of 75 mole % methane and 25 mole % ethane. It enters a furnace with 80% excess air at 30 C. If 8x10^5 kJ/kmol is transferred as heat to the boiler tubes at what temperature does the...

A fuel consists of 75 mole % methane and 25 mole % ethane. It enters a furnace with 80% excess air at 30 C. If 8x10^5 kJ/kmol is transferred as heat to the boiler tubes at what temperature does the flue gas leave the furnace? Assume complete combustion of fuel.