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A fuel consists of 75% mol methane 25% mole of ethane enters an oven with 80%...

A fuel consists of 75% mol methane 25% mole of ethane enters an oven with 80%
excess air at 30 degrees Celsius. If 8 x 10 ^ 5 kJ per kg mol of fuel is transferred as heat to the boiler tubes, at what temperatures do the combustion gases from the furnace come out? Assume combustion
complete

* The steps of the solution of the thermodynamics book edition 7 are not accepted.

* Do the exercise step by step please.

* With clear formulas to know where each number comes from (result).

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