4. Calculate E°cell and indicate whether the overall reaction shown is spontaneous or nonspontaneous. 12(s) + 2e- 21-(aq); E°= 0.53 V Cr3+(aq) + 3e- = Cr(s); E°= -0.74 V Overall reaction: 2Cr(s) + 312(s) – 2Cr*(aq) + (aq) + 6I'(aq)

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