Question: For a combustion process it is given that carbon is burned in prexence of air. If it is given that the % excess oxygen used

For a combustion process it is given that carbon is burned in prexence of air. If it is given that the % excess oxygen used for the combustion process is 21% the equivalent % excess air is
1a.100%
b.21%
c.12.31%
d.19s
Clow my choice
For a combustion process it is given that carbon is burned

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