Hard
Balance the equation: __Fe + __O2 → __Fe2O3
Explanation
Explanation
Balancing iron and oxygen atoms: 2Fe2O3 has 4 Fe and 6 O atoms. To supply 4 Fe atoms we need 4Fe, and to supply 6 O atoms we need 3O2. The balanced equation is 4Fe + 3O2 → 2Fe2O3.
PRO TIP
Re-check your working by substituting the answer back into the original question.