The reactants has greater energy in an exothermic reaction.
Exothermic reactions often produce heat as defined by thermochemistry as "reactions for which the total standard enthalpy change H is negative."
According to the energy diagram below, in an exothermic reaction, the reactants have a greater energy level than the products. The products are therefore more stable than the reactants. Overall, the reaction's H H H is negative, meaning that energy is expelled as heat.
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