$Cu ^{+}+ e ^{-} \longrightarrow Cu ( s )$

__________________________________

$2 Cu ^{+} \longrightarrow Cu ^{2+}+ Cu$

$E_{c e l l}^{o}=E_{C u^{+} / C u}^{0}-E_{C u^{2+} / C u^{+}}^{0}$

$=0.52-0.16$

$=0.36 V$

At equilibrium $\rightarrow E _{\text {cell }}=0$

$E_{c e l l}^{o}=\frac{R T}{n F} l n K$

$\ln K =\frac{ E _{ eell }^{\circ} \times nF }{ RT }$

$\ln K =\frac{0.36 \times 1}{0.025}$

$=14.4=144 \times 10^{-1}$