2. 某一 Galvanic cell 的反應式如下: MnO4
−
(aq) + H+(aq)+CIO3 − (aq) →CIO4−(aq) + Mn2+(aq) + H2O(l)
其半反應式為:
MnO4 – +5e –+ 8H+ → Mn2+ + 4H2O ε° = 1.51V
ClO4
−+ 2H+ + 2e– → ClO3
− + H2O ε° = 1.19V
反應式係數平衡後,反應式之係數總合與ε°分別為何?
(A) 24, ε° = 2.70 V
(B) 21, ε° = –0.19 V
(C) 23, ε° = –2.93 V
(D) 22, ε° = –0.32 V
(E) 23, ε° = 0.32 V