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Use the standard half-cell potentials listed below to calculate the standard cell potential for the following reaction occurring in an electrochemical cell at 25°C. (The equation is balanced.) Pb(s) + Br2(l) → Pb2+(aq) + 2 Br−(aq) Pb2+(aq) + 2 e− → Pb(s) E° = -0.13 V Br2(l) + 2 e− → 2 Br−(aq) E° = +1.07 V