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.