Use the standard reduction potential data to calculate the standard potential for this fuel cell.

$2$H$2($g$)->4$H$+($aq$)+4$e$,$ E$=0$V

O$2($g$)+4$H$+($aq$)+4$e$->2$H$2$O$($l$),$ E$=1\mathrm{.}23$V

Express your answer with the appropriate units.

E$=1\mathrm{.}23$ V

Calculate the value of $\backslash$Delta G$($in kilojoules$)$ at $25$C $.$

Express your answer in kilojoules to three significant figures.

$\backslash$Delta G$=-475$kJ

Calculate the value of K at $25$C $.???$

Express your answer to three significant figures.