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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 $$\ce{S(s) + Mg(s) -> MgS(s)}$$

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  • $\begingroup$ Do a quick search for "equilibrium constant solids", there are several questions which are of help to you. $\endgroup$ Commented Apr 15, 2016 at 22:18

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Concentration of pure solids and liquids is conventionally taken to be 1. Since reaction involves only solids and liquids the equilibrium constant will be 1

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