The chemical formula of water= H20
The chemical formula of oxygen= 02
Finally, the chemical formula of hydrogen peroxide= H202
So, the chemical equation to form hydrogen peroxide looks something like this:
H20 + 02 = H202
This is a disproportionate reaction in which the oxygen in peroxide is –I oxidation state. The oxygen gas on the left side of the equation is at 0 oxidation state, and the oxygen in water is in –II oxidation state.