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-8.5x10^5 J /mol

A fuel mixture of methane (65%. by mole) and ethane (35%, by mole) enters an adiabatic combustion chamber operating at 28C and constant pressure, with 25% excess air. At what temperature does the flue gas leave the furnace with 8.5 x 105 kJ per mole of fuel transferred as heat to boiler tubes? Assume complete combustion of the fuel