The graph shows that the reaction is exothermic, and the law of conservation of energy ensures that the energy released by the reaction is equal to the difference in enthalpy between the reactants and products.
The graph shows that the reaction is exothermic, meaning that it releases heat to the surroundings. This is indicated by the downward slope of the curve, which means that the enthalpy of the products (H) is lower than the enthalpy of the reactants (ΔH).
The law of conservation of energy states that energy cannot be created or destroyed, only transferred or converted from one form to another.
In this reaction, the potential energy stored in the reactants is converted to kinetic energy of the products and heat.
The amount of heat released is equal to the difference in enthalpy between the reactants and products.