Gasoline is a complicated mixture of hydrocarbons boiling between 120 and 400 degrees F, with chemical formulas between C6H14 and C12H26, but a good "average" compound is C8H18 (Octane). Calculate the Stoichiometric Air/Fuel Ratio for gasoline, assuming its chemical formula is C8H18. Calculate the concentration of unburned hydrocarbon (C8H18) in the exhaust gas if only 99.5% of the fuel reacts during combustion.