Solving for the Equilibrium Composition
The law of mass action for a particular reaction (Eq (9.24)) is but a single equation with more than one variable. As an example, Eq (9.21a) contains three unknown mole fractions. There are two principal methods for incorporating the conservation equations into the analysis: the "element conservation" method and the "reaction progress variable" method. Both of these methods require the following input information:
• The temperature and total pressure
• AHo and ASo of the reaction
This information fixes KP by Eq (9.20) and K by Eq (9.24). Thereafter, the two methods differ.
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