One mole of C₃H₈ at 300 K burns with stoichiometric oxygen at 300 K to form CO₂ and H₂O, giving adiabatic flame temperature 5975 K. Under the same conditions with excess oxygen, the flame temperature will be
Correct answer: (C) Lower than 5975 K for any excess oxygen.
Explanation
With complete combustion of the same fuel amount, the released chemical energy is shared by the products and the extra unreacted oxygen. That excess oxygen adds sensible-heat capacity without adding combustion heat. Under the intended complete-combustion heat-balance model, the final adiabatic temperature falls below the stoichiometric value, C.
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