Regarding the EH of hypochlorite and hypochlorous acid.

a$)$ What is the EH of the HOCl$/$Cl$-$ couple at pH $7\mathrm{.}0$ for $0\mathrm{.}028$ mM TOTHOCl and $1$ mM Cl$-?$ Note that TOTHOCl includes both HOCl and OCl$-.$ The pKa of HOCl is $7\mathrm{.}6.$

b$)$ What partial pressure of O$2$ would be required to achieve this EH at pH $7\mathrm{.}0?$ Briefly $(1-2$ sentences$)$ comment on the feasibility of such a pressure