Assuming air contains 20% by volume 0; and 80% N3, for combustion of 100 standard cubic feet per minute (sefm) of methane (CH.4) in air. \mathrm{CH}_{4}+2 \mathrm{O}_{2} \rightarrow \mathrm{CO}_{2}+2 \mathrm{H}_{0}

\mathrm{O} The stoichiometric amount of O; needed for a complete combustion (in scfm) (b) The stoichiometric amount of air needed for a complete combustion (in sefm) (c) The stoichiometric mixture by volume (in % methane in the stoichiometric mixture) (d) The A/F ratio (in a mass/mass ratio)