What describes the enthalpy of formation of a substance?

Related questions

• How are enthalpy changes expressed in chemical equations?
• How can enthalpy change be determined for an aqueous solution?
• How does enthalpy change with pressure?
• How do you calculate standard molar enthalpy of formation?
• Why is enthalpy a state function?
• Why is the enthalpy of formation of oxygen zero?
• Why is enthalpy a state function?
• Why can enthalpy not be measured directly?
• How does pressure affect enthalpy?
• How does enthalpy relate to internal energy?