4Al +3 O2 -> 2Al2O3
Ba + CuO _> BaO + Cu
2NaCl -> 2Na + Cl2
4Fe + 3O2 -> 2Fe2O3
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4Al +3 O2 -> 2Al2O3
Ba + CuO _> BaO + Cu
2NaCl -> 2Na + Cl2
4Fe + 3O2 -> 2Fe2O3