Formulate the equations of the stoichiometric coefficients for stoichiometric combustion (in air) of a generic fuel CxHyOz, where x, y, and z may be any nonnegative integer for pure fuels, or non-negative real numbers for fuel blends. Also, formulate the equations for the mixture molecular mass, mole factions, and mass fractions of the combustion products H2O, CO2, and N2 and the fuel-to-air ratio. Using the formulations, compute the stoichiometric coefficients, mixture molecular mass, mole factions, and mass fractions for methane (CH4) and biodiesel (C19H36O2) fuels.