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Calculate E°cell and Indicate Whether the Overall Reaction Shown Is \to

Question 21

Multiple Choice

Calculate E°cell and indicate whether the overall reaction shown is spontaneous or nonspontaneous.
Co3+(aq) + e-  Calculate E°<sub>cell</sub> and indicate whether the overall reaction shown is spontaneous or nonspontaneous. Co<sup>3+</sup>(aq) + e<sup>-</sup>   Co<sup>2+</sup>(aq) ;E° = 1.82 V MnO<sub>4</sub><sup>-</sup>(aq) + 2H<sub>2</sub>O(l) + 3e<sup>-</sup>   MnO<sub>2</sub>(s) + 4OH<sup>-</sup>(aq) ;E° = 0.59 V Overall reaction: MnO<sub>4</sub><sup>-</sup>(aq) + 2H<sub>2</sub>O(l) + 3Co<sup>2+</sup>(aq)   \to MnO<sub>2</sub>(s) + 3Co<sup>3+</sup>(aq) + 4OH<sup>-</sup>(aq)  A) E°<sub>cell</sub> = -1.23 V,spontaneous B) E°<sub>cell</sub> = -1.23 V,nonspontaneous C) E°<sub>cell</sub> = 1.23 V,spontaneous D) E°<sub>cell</sub> = 1.23 V,nonspontaneous E) E°<sub>cell</sub> = -0.05 V,nonspontaneous
Co2+(aq) ;E° = 1.82 V
MnO4-(aq) + 2H2O(l) + 3e-  Calculate E°<sub>cell</sub> and indicate whether the overall reaction shown is spontaneous or nonspontaneous. Co<sup>3+</sup>(aq) + e<sup>-</sup>   Co<sup>2+</sup>(aq) ;E° = 1.82 V MnO<sub>4</sub><sup>-</sup>(aq) + 2H<sub>2</sub>O(l) + 3e<sup>-</sup>   MnO<sub>2</sub>(s) + 4OH<sup>-</sup>(aq) ;E° = 0.59 V Overall reaction: MnO<sub>4</sub><sup>-</sup>(aq) + 2H<sub>2</sub>O(l) + 3Co<sup>2+</sup>(aq)   \to MnO<sub>2</sub>(s) + 3Co<sup>3+</sup>(aq) + 4OH<sup>-</sup>(aq)  A) E°<sub>cell</sub> = -1.23 V,spontaneous B) E°<sub>cell</sub> = -1.23 V,nonspontaneous C) E°<sub>cell</sub> = 1.23 V,spontaneous D) E°<sub>cell</sub> = 1.23 V,nonspontaneous E) E°<sub>cell</sub> = -0.05 V,nonspontaneous
MnO2(s) + 4OH-(aq) ;E° = 0.59 V
Overall reaction:
MnO4-(aq) + 2H2O(l) + 3Co2+(aq) \to MnO2(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

Correct Answer:

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