A 65% excess air at 30 °C mixing with gas fuel containing of 6 mole % methane and ethane. Air and fuel enter a furnace with and completely burning. If 50000 kJ/kmol gas fuel is transferred as heat to boiler, what temperature does the burned gas exit the furnace? CH4 +202 = CO2 + 2H2O(g) C2H6+3.502=2CO2 + 3H2O(g)

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