10 moles of ethane is supplied with 49 moles of oxygen, what is the percentage of excess oxygen?(a) 20%(b) 40%(c) 50%(d) 70%This question was addressed to me by my college professor while I was bunking the class.My doubt is 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

10 moles of ethane is supplied with 49 moles of oxygen, what is the pe

1.	10 moles of ethane is supplied with 49 moles of oxygen, what is the percentage of excess oxygen?(a) 20%(b) 40%(c) 50%(d) 70%This question was addressed to me by my college professor while I was bunking the class.My doubt is 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 option is (b) 40% For explanation I would say: The balanced REACTION is C2H6 + 3.5O2 -> 2CO2 + 3H2O, => O2 required = 3.510 = 35 moles, => percentage of excess oxygen = 100(49 – 35)/35 = 40%.

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