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1.[解] 负极反应 Zn-2e=Zn~(2+) E°_1=-0.762V 正极反应 O_2+4H~++4e=2H_2O E°_+=1.299V 电池结构 Zn/Zn~(2+),H~+,O_2;H_2O/Pt 电池反应 2Zn+2H_2O→2Zn~(2+)+4H~++O_2 电池电动势 E°=E°~+-E°_-=1.299-(-0.762)=2.061V (即在标准状态下的可逆电动势)
1. [Solution] negative electrode reaction Zn-2e = Zn 2+ E ° _1 = -0.762V Positive electrode reaction O 2 + 4H ~ + 4e = 2H_2O E ° _ + = 1.299V Battery structure Zn / Zn ~ (2 +), H ~ +, O_2; H_2O / Pt Battery reaction 2Zn + 2H_2O → 2Zn ~ (2 +) + 4H ~ + + O_2 Battery electromotive force E ° = E ° ~ + -E ° _- = 1.299 - (- 0.762 ) = 2.061V (that is, the reversible electromotive force in the standard state)