Nickel carbonyl decomposes to form nickel and carbon monoxide, like this: Ni(CO)4(g) → Ni(s)+ 4CO(g)

At a certain temperature, a chemist finds that a 2.6 L reaction vessel containing a mixture of nickel carbonyl, nickel, and carbon monoxide at equilibrium has the following composition:

compound amount
Ni(CO)4 0.597g
Ni 12.7g
CO 1.98g

Required:
Calculate the value of the equilibrium constant for this reaction.