9. The standard potential for the following reaction: Zn + 2Ag+ → Zn2+ + 2Ag is 1.56 V. Calculate the cell potential for the following reaction: 2Zn2+ + 4Ag → 2Zn + 4Ag+
(A) 1.56 V
(B) -1.56 V
(C) 3.12 V
(D) -3.12 V

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統計： A(1), B(1), C(2), D(1), E(0) #347696