The balanced reaction is: 4Fe + 3O2 --> 2Fe2O3 Stoichiometrically: (1.0 mol Fe)(2 mol Fe2O3 / 4 mol Fe) = 0.50 mol Fe2O3 If the actual yield is only 0.325 mol Fe2O3, the % yield can be calculated by dividing actual by theoretical yield: 0.325 / 0.5 x 100% = 65% yield