One kmol of ethane (C₂H₆) is burned with air during a combustion process. If the combustion is complete and the air-fuel ratio is 22, the number of moles of free O₂ in the products is

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Quizplus · Accepted Answer

Solved by EES Software. Solutions can be verified by copying-and-pasting the following lines on a blank EES screen. 
"The Fuel is C2H6"
n_C=2
n_H=6
AF=22
m_fuel=n_H*1+n_C*12
a_th=n_C+n_H/4
(coeff-1)*a_th=n_excessO2 "O2 balance: Coeff=1 for theoretical combustion, 1.5 for 50% excess air"
n_O2=coeff*a_th
n_N2=3.76*n_O2
m_air=n_O2*32+n_N2*28
AF=m_air/m_fuel

One Kmol of Ethane (C2H6) Is Burned with Air During

One Kmol of Ethane (C₂H₆) Is Burned with Air During