42 exothermic enthalpy diagram
The enthalpy (heat content) of a substance is given the symbol H. The heat of reaction is the energy lost or gained during a chemical reaction.. Since the heat of reaction is equal to the difference in enthalpy between the products and reactants. ∆H = H(products) - H(reactants) •For exothermic reactions, ∆ H = A negative Δ H \Delta H Δ H value means a reaction is exothermic, because the enthalpy of the products is less than the enthalpy of the reactants. This means that the reaction produced lower energy products from higher energy reactants, and the change in heat was released from the system to the surroundings. Exothermic enthalpy diagram