An exorgonic reaction is a reaction where energy is being released. These type of reactions do not need input of energy to happen. Like any other processes, energy for this process is conserved which is not destroyed or created rather transformed to other type.
Explanation: Exergonic reactions are defined as the chemical reactions in which energy is released.
All the chemical reactions follow law of conservation of energy and mass which means that energy and mass remains same throughout the chemical reaction.
For these chemical reactions, reactants are present at a higher energy level and products are at a low energy level. But, the energy of the reaction should remain conserved. So, the extra amount of energy is released during the reaction.
Hence, the total amount of energy does not decrease in an exergonic reaction.