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Calculate the standard reduction potential for the reaction of Cu(III) to Cu(II)
Use the following data:
1) Cu^+3 + 2e^- -> Cu^+, E°1 = 1.28 V
2) Cu^+2 + e^- -> Cu^+, E°2 = 0.15 V
3) Cu^+2 + 2e^- -> Cu(s), E°3 = 0.34 V
4) Cu^+ + e^- -> Cu(s), E°4 = 0.52 V

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