Equilibrium Constant Calculation
Consider the equilibrium:
A(g) + 2 B(g) <-> C(g)
If there were 6.0 mol of A and 4.0 mol of B placed into a
2.0 L container, after a period of time an equilibrium was reached
and there was 1.0 mol of C. Calculate the K value.
Solution:
Step 1 – change moles to concentrations (mol/L)
Step 2 – use an ICE table of calculation
A(g) + 2 B(g) <-> C(g)
Initial
3.0
2.0
0.0
change___________-0.5___-1.0____+0.5________________
equilibrium
___
___
___
Step 3 – Calculate the equilibrium line from the concentration
that must have been removed from the reactant.
(A and C are in a 1:1 ratio and B and C are in a 2:1 ratio)
Step 4 - put the equilibrium concentrations into the equilibrium
constant expression.
K=
[C]___
[A] [B]2
K=
____
K=