To balance the chemical equation, we need to make sure that the number of atoms of each element on the reactant side is equal to the number of atoms of the same element on the product side.The given chemical equation is:Fe + O2 -> Fe2O3First, let's balance the Fe iron atoms:2Fe + O2 -> Fe2O3Now, we have 2 Fe atoms on both sides. Next, let's balance the O oxygen atoms:2Fe + 3/2 O2 -> Fe2O3However, it's not ideal to have a fraction in a balanced chemical equation. To remove the fraction, we can multiply the entire equation by 2:2 2Fe + 3/2 O2 -> 2 Fe2O3 Which simplifies to:4Fe + 3O2 -> 2Fe2O3Now, the chemical equation is balanced with 4 Fe atoms and 6 O atoms on both sides.