81. Calculate E°cell and indicate whether the overall reaction shown is spontaneous or nonspontaneous. 5d09c5254d762.jpg  Overall reaction: MnO4–(aq) + 2H2O(l) + 3Co2+ (aq)5d09c591d6baf.jpgMnO2(s) + 3Co3+(aq) + 4OH– (aq)
(A) E°cell = –1.23 V, spontaneous
(B) E°cell = –1.23 V, nonspontaneous
(C) E°cell = 1.23 V, spontaneous
(D) E°cell = 1.23 V, nonspontaneous
(E) E°cell = –0.05 V, nonspontaneous

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統計： A(4), B(40), C(2), D(0), E(0) #2020355

詳解 (共 1 筆)

#6450829

E°cell= 0.59V−1.82V=−1.23V

根據熱力學，
電池電位為負 → ΔG為正 → 非自發反應
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