Calculate the equilibrium constant K for the following reaction at 25°C from standard electrode potentials for the following reaction: Sn4+(aq) + Hg(l) => Sn2+(aq) + Hg22+(aq).

Sn4+(aq) + 2e- => Sn2+(aq) ; E°SRP = +0.15 V
Hg22+(aq) + 2e- => 2 Hg(l) ; E°SRP = +0.80 V