Respuesta :
The amount of heat released or absorbed during a reaction that takes place under constant pressure is referred to as the enthalpy change. The sign for it is H, which can be read as "delta H."
What is ΔH°f ?
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 sign H f.
What is Enthalpy ?
A thermodynamic system's enthalpy, which is one of its properties, is calculated by adding the system's internal energy to the product of its pressure and volume. It is a state function that is frequently employed in measurements of chemical, biological, and physical systems at constant pressure, which the sizable surrounding environment conveniently provides.
As a result of subtracting the total of the standard enthalpies of formation of the reactants from the sum of the standard enthalpies of formation of the products, the standard enthalpy change of formation is determined and the typical values for formation enthalpy.
Energy change = energy in - energy out. To calculate the energy change for a reaction, add the bond energies for all the bonds in the reactants (this is the "energy in") and the bond energies for all the bonds in the products (this is the "energy out").
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