O₂_req = C + H/4 - O/2; Air = O₂_req / y_O2; Excess air factor = 1 + EA/100 MW_fuel = 12.011·C + 1.008·H + 15.999·O AFR_mass = (Air_moles × MW_air) / (Fuel_moles × MW_fuel), with MW_air ≈ 28.97 g/mol
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