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We were given standard reduction potentials and were asked to find standard reduction potential for the half-reaction.

Given the following two standard reduction potentials,
M3+ + 3e- → M E° = -0.10 V
M2+ + 2e- → M E° = -0.50 V
Compute the standard reduction potential E° for the half-reaction:
M3+ + e- → M2+

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