# The equilibrium constant of a reaction only involving pure solid or liquid

How to calculate the equilibrium constant of a reaction only involving pure solid or liquid. For example reaction $$\ce{S(s) + Hg(l) -> HgS(s)}$$ or $$\ce{S(s) + Mg(s) -> MgS(s)}$$

• Do a quick search for "equilibrium constant solids", there are several questions which are of help to you. – orthocresol Apr 15 '16 at 22:18