2 H₂O → 2 H₂ + O₂
O₂ + 2 Mg → 2 MgO
MgO + H₂SO₄ → H₂O + MgSO₄
4 Cu + O₂ → 2 Cu₂O
2 Cu₂O + O₂ → 4 CuO
CuO + 2 HBr → H₂O + CuBr₂
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2 H₂O → 2 H₂ + O₂
O₂ + 2 Mg → 2 MgO
MgO + H₂SO₄ → H₂O + MgSO₄
4 Cu + O₂ → 2 Cu₂O
2 Cu₂O + O₂ → 4 CuO
CuO + 2 HBr → H₂O + CuBr₂