0Jack A Lopez 5 years ago The mole ratio of hydrogen to oxygen, produced by an electrolytic cell designed to produce both, this ratio should be close to stoichiometric; i.e. 2:1, i.e. the same ratio as found in the balanced equation, 2 H2 +1 O2 = 2 H2OFor burning fuel and oxidizer, in an internal combustion engine (ICE) the ratio of moles of fuel to moles of oxidizer can be exactly stoichiometric, or somewhat less than that ratio(called lean), or somewhat more (called rich). Usually there is a pretty wide range. The mixture does not have to be perfectly stoichiometric for the engine to keep firing. However, for a non-stoichiometric mixture, there is necessarily going to be some lost efficiency, due to unreacted fuel (for lean mixture) or unreacted oxidizer (for rich mixture) in the exhaust.