Question: what are the reactants in the combustion of propane?
Answer: One mole of propane needs five moles of oxygen for complete oxidation to form carbon dioxide and water. The balanced equation for combustion of propane is: C3H8 + 5O2 = 3CO2 + 4H2O. The products are 3 moles of CO2 and 4 moles of H2O for every mole of the alkane burnt completely.