Which of the following reactions (s) show(s) heterogeneous equilibria? (a) N g 3H g 2NH g (b) H O l H O g (c) CaCO s CaO s CO g

The equilibrium water vapour and liquid water in a closed container is an example of heterogeneous equilibrium. 2 2 H O l H O g In this example there is a gas phase and a liquid phase. In the same way, equilibrium between two solid phase and a gas phase. 3 2 CaCO s CaO s CO g