Respuesta :
The heat released or absorbed during the reaction, or the difference in enthalpy between the reactants and products, is known as the enthalpy of reaction. The enthalpy change between the reactants (elements in their standard state) and the compound is known as the enthalpy of formation of a compound (product).
Enthalpy of reaction is defined so that it solely depends on the conditions that are prescribed for it, rather than just on the actual circumstances in which reactions take place. When thermochemical measurements are actually taken of the reacting system, there are two general requirements that must be met.
The energy released or consumed when one mole of a substance is formed under typical conditions from its pure constituents is measured by the standard enthalpy of formation. The standard enthalpy of formation is represented by the symbol Hf. A degree denotes a standard enthalpy change. If the products and reactants are well-studied, standard enthalpies of formation can still be used to forecast reaction enthalpies even for new reactions.
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