K Calculations

Calculating Equilibrium Pressures of Reactants and Products

Concentrations or gas pressures of reactants and products at equilibrium can be calculated from the initial concentrations or gas pressures of reactants and products and equilibrium constants. There are many variations of this procedure, but because our goal is only to introduce you to this category of calculations, we will restrict our examples to gas-phase reactions, for which you are given the initial partial pressures of reactants, the equation for the reaction, and the KP that corresponds to the equation. The equations for the reactions of this kind that you will see will have one of two forms:

A(g)  +  B(g)        C(g)  +  D(g)

or      A(g)  +  B(g)        2C(g)

Click here to see a Sample Study Sheet that summarizes this procedure.

Click here to see an example. 

Click here to see an exercise that will allow you to try this task yourself.  


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