Calculate the cell potential and the equilibrium constant for the following reaction at $298K$ :

$2C{u}^{2+}(aq)+Hg(l)longrightarrow2C{u}^{+}(aq)+H{g}^{2+}(aq)$

Hint: Carry at least $5$ significant figures during intermediate calculations to avoid round off error when taking the antilogarithm.

Equilibrium constant: $$