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Suppose you want to study the equilibrium of the reaction of a metal like zinc $\ce{Zn}$ with water to produce $\ce{ZnO(s)}$ and $\ce{H2}$ :$$\ce{Zn(s) + H2O(g) <=> ZnO(s) + H2(g)}$$ At high temperature, the equilibrium constant may be written $$K_\mathrm{1}=\frac{[\ce{ZnO}]·p\ce{(H2)}}{[\ce{Zn}]·p\ce{(H2O)}}$$ In this expression three parameters are ...