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Define Equilibrium between two solid phases and a gas phase?
Consider the following reaction equilibrium:
3 CuO(s) + 2NH3 (g) ↔ 3 Cu(s) + 3H2O (g) + N2 (g)
According to the species approach, there are five species, one relation (for reaction equilib- rium), and three phases. The phase rule gives
F = 2 + s - r - P = 3
It is more difficult to apply the components approach to this example. As components, we might choose CuO and Cu (from which we could prepare the solid phases) and also NH3 and H2O. Then to obtain the N2 needed to prepare the gas phase, we could use CuO and NH3 as reactants in the reaction 3 CuO + 2NH3 → 3H2O +N2 and remove the products Cu and H2O. In the components approach, we are allowed to remove substances from the system provided they are counted as components.
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