The combustion reaction of propane (C3H8) is given by the equation C3H8 + 5O2 → 3CO2 + 4H2O. What is the stoichiometric air-fuel ratio for this reaction?
Correct: C
To find the stoichiometric air-fuel ratio, first, calculate the number of moles of oxygen required for complete combustion, which is 5 moles of O2 per mole of C3H8. Since air is approximately 21% oxygen by volume, the stoichiometric air-fuel ratio can be calculated based on the volume of air needed to provide this amount of oxygen.