Дано:                                           Решение:

m(Fe2O3) = 96 г            96 г                           Х г

Найти:                          Fe2O3   +   3H2     =    2Fe      +     3H2O

m(Fe) =?                  n = 1 моль                    n = 2 моль

                               М = 160 г/моль             М = 56 г/моль

                             m = 160 г                        m = 112 г

                                96 г Fe2O3       -     Х г Fe

                             160 г Fe2O3       -      112 г Fe

                             m(Fe) =96 * 112 / 160 = 67,2 г