So our products are lower than Our reactants. And this change in energy is the same as the change in energy that we saw here. Another name for that is change in enthalpy. So change in H. And from 1 mol, where whenever 1 mol of H reacts with Another Mole of H to form 1 Mol of H 2104, energy will Be Released Into The environment. And this is known as an exothermic reaction. In other words, exothermic reaction is A reaction in which the energy of products is lower than the energy of reactants, and the energy is released into the environment.