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Propane gas is burned using air, both are at 25c and 1 atm. excess air is...

Propane gas is burned using air, both are at 25c and 1 atm. excess air is used. The products of combustion are carbon dioxide(gas) and vapor water along with excess oxygen and nitrogen exit the reactor at 1520 k. Predict the percentage of excess air (in % units not fractional) used in the steady flow combustion chamber. (Correct answer is 100% - please explain and show why)

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