For a given exothermic reaction, and are the equilibrium constants at temperatures and respectively. Assuming that heat of reaction is constant in temperatures range between and , it is readily observed that
Step 1: Given data
Equilibrium constant at temperature and and
The heat of the reactionconstant
Step 2: Observing and
Using formula
So, (exothermic reaction)
As a result, for an exothermic reaction, the equilibrium will move in the opposite direction as the temperature rises, and the equilibrium constant's value will decrease according to the Le-Chatelier principle.
Therefore, for a given exothermic reaction, where and are the equilibrium constants at temperatures and respectively and heat of reaction is constant.