Question
What is the equilibrium concentration of each of the substances in the equilibrium when the initial concentration of ICl was 0·78 M?
Solution
Let at equilibrium,
Then 
Initial conc. 0.78 M 0 0
At eqm. 0.78 - 2x x x
Applying the law of chemical equilibrium
Putting the values in expression (1), we have
Hence, at equilibrium 
and
