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What is the percentage of excess air, if 10 moles of air entered the process and only 5 moles of that are required?

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What is the percentage of excess air, if 10 moles of air entered the process and only 5 moles of that are required?

(a) 10%

(b) 50%

(c) 75%

(d) 100%

The question was posed to me in semester exam.

I'd like to ask this question from Material Balances Involving Combustion topic in chapter The Chemical Reaction Equation & Stoichometry, Material Balances for Processes Involving Reaction and Multiple Units of Basic Chemical Engineering

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Right answer is (d) 100%

Explanation: Percentage of excess air = 100*(10 – 5)/5 = 100%.

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