RATE OF CHEMICAL REACTIONS
EQUILIBRIUM CONSTANT AND EXTENT OF A CHEMICAL REACTION
It has been found experimentally that at a particular temperature, when equilibrium is achieved, the ratio between the concentration of products and reactants becomes constant. This can be represented with the help of following formula:
Example:- In reaction
N2 (g) +3H2 (g) 2NH3 (g)
Here the concentration of each term [NH3], [N2] and [H2], is raised to the power equal to the stoichiometric coeffient and Kc is called equilibrium constant.
Importance of equilibrium constant Kc: Magnitude of equilibrium constant Kc indicates the extent of a chemical reaction. Larger the value of Kc, higher will be the concentration of products at equilibrium. Smaller value of Kc indicates the lower concentration of the products at equilibrium.