In the Mond process for the purifi cation of nickel, carbon monoxide is reacted with heated nickel to produce Ni(CO)4, which is a gas and can therefore be separated from solid impurities:
Ni(s) + 4CO(g) ⇌ Ni(CO)4(g)
Given that the standard free energies of formation of CO(g) and Ni(CO)4(g) are -137.3 kJ/mol and -587.4 kJ/mol, respectively, calculate the equilibrium constant of the reaction at 80°C. Assume that ∆G°f is temperature independent.