3 Mg + Fe₂O₃ → 2 Fe + 3 MgO
Explanation:
To balance the a chemical equation the number of atoms of each element entering the reaction have to be equal to the number of atoms of each element leaving the reaction, in order to conserve the mass.
In our case we have:
3 Mg + Fe₂O₃ → 2 Fe + 3 MgO
3 Mg atoms are entering the reaction 3 Mg atoms are leaving the reaction
2 Fe atoms are entering the reaction 2 Fe atoms are leaving the reaction
3 O atoms are entering the reaction 3 O atoms are leaving the reaction
Learn more about:
balancing chemical equations
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