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Problem- Given that the partial pressure of O2 in the atmosphere is 0.20 atm and the concentration of H3O+ is 2.0 x 10-6 M, determine the half-cell potential for the reduction of O2 according to the reaction-

O2 + 4 H3O+ + 4e- ---> 6 H2O E° = 1.229 V

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