What is E° for O2 + 4Fe2+ + 4H+ —> 2H2 O + 4Fe3+?

What is E° for O2 + 4Fe2+ + 4H+ —> 2H2 O + 4Fe3+?

Fe3+ + e- --> Fe2+ E° = +0.769 V
O2 + 4H+ + 2e- --> 2H2O

Find out the E° for the second reaction. It is +1.23 V.

So the E° for the whole reaction =
1.23-0.769 = 0.461 V

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