(8分)已知:(1)Fe 2 O 3 (s) + 3CO(g) ='=' 2Fe(s) + 3CO 2 (g) △H 1 = -26.7 kJ/mol (2)3Fe 2 O 3 (s) + CO(g) ='=' 2Fe 3 O 4 (s) + CO 2 (g) △H 2 = -50.75 kJ/mol (3) Fe 3 O 4 (s) + CO(g) ='=' 3FeO(s) + CO 2 (g) △H 3 = -36.5 kJ/mol 计算反应:2FeO(s) + 2CO(g) ='=' 2Fe(s) + 2CO 2 (g)的△H(要有计算过程)。