Question

question / of 2/ what is the best definition of the enthalpy of formation, δhf? a. the energy released when products form in a reaction b. the energy absorbed when products form in a reaction c. the energy required for a molecule to form from its elements d. the energy required for an atom to form from its subatomic particles

Explanation:

The enthalpy of formation ($\Delta H_f$) is defined as the energy change when one mole of a compound is formed from its constituent elements in their standard states. This aligns with the idea of the energy required for a molecule to form from its elements.

Answer:

C. The energy required for a molecule to form from its elements