What would be the electrode potential

Question:

What would be the electrode potential for the given half cell reaction at $\mathrm{pH}=5$ ?_________

$2 \mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{O}_{2}+4 \mathrm{H}^{\oplus}+4 \mathrm{e}^{-} ; \mathrm{E}^{0}$ red $=1.23 \mathrm{~V}$

$\left(\mathrm{R}=8.314 \mathrm{~J} \mathrm{~mol}^{-1} \mathrm{~K}^{-1} ;\right.$ Temp $=298 \mathrm{~K} ;$ oxygen

Solution:

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