In an experiment, methane is burned with the theoretically required amount of oxygen for complete combustion. Because of faulty operation of the adiabatic burner, the reaction does not proceed to completion. You may assume all of the methane that does react forms H2O and CO2. If the reactants are fed into the reactor at 25ºC and 1 bar and the exiting gases leave at 1000ºC and 1 bar, determine the percentage of methane that passes through the reactor unburned.