Discussion
For that coal the theoretical air per kg, taking air as 23 per cent oxygen by mass, is about
Answer: C
Correct answer: 10.8 kg
Air is 23 per cent oxygen by mass, so the theoretical air is the theoretical oxygen divided by 0.23: \[ \frac{2.48}{0.23} = 10.8\ \text{kg of air per kg of coal.} \] Working by volume instead the fraction is 21 per cent, so the two must not be mixed. A good bituminous coal typically needs 10 to 11 kg of air per kg, which is a useful check on any such calculation.
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