What are the half-cell potentials and the electrochemical potential of the whole cell? Negative Electrode: Mg -> Mg2+ + 2e- Mg + H2CO3 -> MgCO3 + H2 Positive Electrode: MgO + 4H+ + 2e- -> Mg2+ + 2H2O Mg2+ + CO32- -> MgCO3 Combined Reaction: Mg + MgO + 2 H2CO3 -> 2 MgCO3 + H2O.

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