GKFix MCQ Question

What is the standard enthalpy of formation (∆fH⁰)?

• A. Enthalpy change during combustion of 1 mole of a substance
• B. Enthalpy change during vaporization of a substance
• C. Enthalpy change during sublimation
• D. Enthalpy change when 1 mole of a compound is formed from its elements in their standard states