24. 鼓風爐中以 CO 為還原劑,可將氧化鐵還原成鐵元素,其反應如下:
Fe2O3(s) + 3CO(g) → 2Fe(s) + 3CO2(g) ΔH° = –23 kJ
3Fe2O3(s) + CO(g) → 2Fe3O4(s) + CO2(g) ΔH° = –39 kJ
Fe3O4(s) + CO(g) → 3FeO(s) + CO2(g) ΔH° = 18 kJ
請計算反應 FeO(s) + CO(g) → Fe(s) + CO2(g)的 ΔH°為何?
(A) –66 kJ
(B) –33 kJ
(C) –11 kJ
(D) 11 kJ
(E) 66 kJ