Ethane $($C$2$H$6)$ burns completely with $150\%$ of theoretical air entering at $74$F$,1$ atm, $50\%$ relative humidity. The dry air component can be modeled as $21\%$ O$2$ and $79\%$ N$2$ on a molar basis. The combustion products leave at $1$ atm. na Step $1$ Your answer is incorrect. For complete combustion of ethane$($C$2$H$6)$ with the theoretical amount of air, what is the number of moles of oxygen $($O$2)$ per mole of fuel?