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In this problem we wish to develop the combustion equation and determine the air-fuel ratio for the complete combustion of n-Butane (C4H10) with theoretical air.

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In this problem we wish to develop the combustion equation and determine the air-fuel ratio for the complete combustion of n-Butane (C4H10) with theoretical air.

(a) 15.4 kg-air/kg-fuel

(b) 12.5 kg-air/kg-fuel

(c) 12.4 kg-air/kg-fuel

(d) 15.5 kg-air/kg-fuel

The question was asked in quiz.

My question comes from Heat of Reaction for Processes with Biomass Production in section Energy Balance of Bioprocess Engineering

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Correct answer is (d) 15.5 kg-air/kg-fuel

To explain I would say: i) Theoretical air :

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