What is the difference between standard enthalpy of combustion and standard enthalpy of formation?
1 Answer
Standard enthalpy change of combustion, or
Standard enthalpy of formation, or
Explanation:
Combustion is always an exothermic process. Because of this, enthalpy change of combustion must always be positive; on the other hand, enthalpy change of formation can be either positive or negative, since a reaction to form 1 mole of a substance can be either exothermic or endothermic.