The coefficients in a balanced chemical equation provide the mole-to-mole stoichiometry among the What mass of water is produced from the complete combustion of 2.20103g of methane? reactants and products. The molar mass (in g/mol) can be used as the conversion factor Express your answer with the appropriate units. botween moles and the mass of a substance. Thus, the balanced equation and molar masses can be used in conjunction with one another to calculate the masses involved in a reacton. Part D What mass of oxygen is needed for the complete combustion of 2.20103g of methane