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The extent of a reaction is 10, and the stoichiometric coefficient of O2 is 2.5, if the moles of O2 entering the process is 45, what is the percentage of excess air?(a) 20%(b) 40%(c) 60%(d) 80%I got this question during a job interview.I need to ask this question from Material Balances Involving Combustion topic in division The Chemical Reaction Equation & Stoichometry, Material Balances for Processes Involving Reaction and Multiple Units of Basic Chemical Engineering

Answer»

Correct answer is (d) 80%

To elaborate: MOLES of O2 REQUIRED = 10*2.5 = 25, => Percentage of excess air = 100*(45 – 25)/25 = 80%.


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