What is the standard enthalpy change of formation and how does it differ from the standard enthalpy change of reaction?

The enthalpy change of formation is the enthalpy change when 1 mole of a compound is formed from its constituent elements in their standard states. Meanwhile the enthalpy change of reaction is the enthalpy change that accompanies a reaction in the molar quantities expressed in the chemical equation. Enthalpy is the heat or energy content stored in a chemical reaction.

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