Answer:
The change in enthalpy when one mole of a material is created from its pure components under the same conditions—1 atm of pressure and 298.15 K—is known as the standard enthalpy of formation.
Step-by-step explanation:
The energy released or absorbed when one mole of a material is formed under typical circumstances from its pure constituents is measured by the standard enthalpy of formation.
- The symbol of the standard enthalpy of formation is ΔHf.
- Δ = A change in enthalpy
- The symbol o = A denotes a typical enthalpy shift.
- f = The f denotes that the material is made up of its constituent components.
The following equation represents the typical use of the standard enthalpy change of formation (originating from the fact that enthalpy is a state function):
The standard enthalpy shift of formation is determined by subtracting the total of the conventional enthalpies of formation of the reagents from the total of the normal enthalpies of formation of the constituents.
The standard enthalpy of formation is defined as the change in enthalpy when one mole of a substance in the standard state (1 atm of pressure and 298.15 K) is formed from its pure elements under the same conditions.
Enthalpy is the heat energy that is being absorbed or evolved during the progression of a chemical reaction.
The enthalpy is given the symbol H. H indicates the amount of energy. The change of enthalpy is given as ∆H, and the symbol ∆ indicates the change of enthalpy.
The heat of formation is a form of enthalpy. heat of formation is the amount of energy either absorbed or released during the formation of a compound