I'm not entirely sure I understand the question, but here are a few answers: The difference in (internal) energy and enthalpy is given by equations like H = U + PV. The enthalpy includes a PV term that the internal energy does not. On the other hand, enthalpy and several other quantities (H, U, G, A, others) are all described by the term "energy". Sometimes someone may casually say "formation energy" when they really mean formation enthalpy. In that sense, there may not be a difference between the two. The Gibbs-Helmholtz equation describes the relationship between how G and H change with temperature. So it can't be used to derive the formation enthalpy, exactly, but it could be used to help describe how the formation free energy and formation enthalpy change with T.
Can you please explain the difference between formation enthalpy and formation energy ? Can you derive formation energy from Gibbs Helholtz equation?
I'm not entirely sure I understand the question, but here are a few answers:
The difference in (internal) energy and enthalpy is given by equations like H = U + PV. The enthalpy includes a PV term that the internal energy does not.
On the other hand, enthalpy and several other quantities (H, U, G, A, others) are all described by the term "energy". Sometimes someone may casually say "formation energy" when they really mean formation enthalpy. In that sense, there may not be a difference between the two.
The Gibbs-Helmholtz equation describes the relationship between how G and H change with temperature. So it can't be used to derive the formation enthalpy, exactly, but it could be used to help describe how the formation free energy and formation enthalpy change with T.