Calculate E°cell and indicate whether the overall reaction shown is spontaneous or nonspontaneous.

CO³⁺(aq) + e- CO²⁺(aq); E° = 1.82 V
MnO₄⁻(aq) + 2H₂O(l) + 3e- MnO₂(s) + 4OH-(aq); E° = 0.59 V