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chemical engineering fuels and combustion
1. A carbonaceous fuel (containing no H2 or hydrocarbons) is burnt and the resulting flue gas contains 21% CO2. It means that
(A): 21% excess air has been used for combustion.
(B): 21% excess oxygen has been used for combustion.
(C): complete combustion of fuel has taken place.
(D): no excess air has been used for combustion.
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