Calculating Equilibrium Pressures
You are asked
for the equilibrium partial pressures of reactants and products, and you
are given the equation for the reaction, its KP (or a table
of KP values), and the initial partial pressures of
Write the equilibrium constant expression that corresponds to the
Set up a table for displaying the initial pressures, the changes in
pressure, and the equilibrium pressures.
For our examples, assign x to the decrease
in pressure of each reactant. The equilibrium partial pressure of each
reactant will be the given initial partial pressure minus x. The
equilibrium partial pressure of product will be x for reactions that
have the first general form below or 2x for reactions that have the
C(g) + D(g)
A(g) + B(g)
Plug the equilibrium concentration terms into the equilibrium constant
Solve for x.
Use x to calculate the equilibrium concentrations of reactants and
here to see an example.
here to see an exercise that will allow you to try this task yourself.
Return to the
Equilibrium Calculations Page.