Consider the following generic reaction. a 2 b ( g ) − ⇀ ↽ − 2 a ( g ) + b ( g ) the initial concentration of a 2 b is 0.87 m and the initial concentrations of a and b are assumed to be zero. what is the equilibrium constant expression ( k c ) , if the equilibrium concentration of b is represented by x ?

Answer : The equilibrium constant expression will be

Solution :

Equilibrium constant : It is defined as the equilibrium constant. It is defined as the ratio of concentration of products to the concentration of reactants.

The given equilibrium reaction is,

Initially conc.     0.87          0           0

At equilibrium  (0.87-x)      2x          x

The expression of will be,

Therefore, the equilibrium constant expression will be