# Please solve and kindly tell..When and why do we take into account the pressure of the reacting specied in the nernst equation....??! Like we have in this question . Also are there any.other modifications in the nernst equation...??

pH = - log[H+]
3 = - log[H+]
-antilog 3 = [H+]
Therefore, [H+] = 10-3 M

Oxidation half reaction:
Fe(s) $\to$ Fe2+ + 2e-     ] X 2
4H+ + O2 + 4e- $\to$ 2H2O

Number of electrons involved, n = 4

Cell potential is given as,

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