LEO → Loses electrons = Oxidation
GER → Gain electrons = Reduction
Separating the half-reactions:
Inspecting the Oxidation state of Co and O
Reactant: O2 → elemental state → OS = 0
Separate this redox reaction into its component half-reactions.
3O2 + 4Co → 2Co2O3
Use the symbol e- for an electron.
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