Take the chemical equation of electrolytic water as an example. What information can I get?

① indicates that the reactant is h2o, the products are h2 and o2, and the reaction conditions are electrolysis.

② indicates that every 36 parts by mass of water is decomposed into 4 parts by mass of hydrogen and 32 parts by mass of oxygen under electrolytic conditions.

③ indicates that every two water molecules can be decomposed into two hydrogen molecules and one oxygen molecule.