Discussion
Consider the following statements about the air to fuel ratio.
1. It may be quoted on a mass or a mole basis.
2. The two values differ numerically for the same combustion.
3. The ratio is the same for every hydrocarbon fuel.
Answer: B
The first two are correct and the basis must always be stated. The third is wrong, since the ratio depends on the hydrogen to carbon ratio of the fuel and differs between methane and coal. Methane needs roughly seventeen kilograms of air per kilogram.
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