[例 -3 已知298K时:-|||-① (s)+dfrac (3)(2)(O)_(2)(g)=!=!= (Al)_(2)(O)_(3)(g) Delta H=(-1669.8kJcdot (mol)^-1-|||-② (s)+dfrac (3)(2)(O)_(2)(g)=(Fe)_(2)(O)_(3)(s) Delta H=(-822.2kJcdot (mol)^-1-|||-求: (s)+(Fe)_(2)(O)_(3)(s)=!=!= 2Fe(s)+(Al)_(2)(O)_(3)(s) 的 (Delta )_(r)(H)_(m)^theta (3) ;若上述反应产-|||-生1.00kg的Fe,能放出多少热量。