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The standard enthalpy of formation is the enthalpy change between the elements in their standard state (reactants) and the compounds (products). The standard enthalpy of reaction is the heat given off or taken up for the reaction, in other words, the enthalpy difference between the reactants and the products.
The standard enthalpy of formation is the change in enthalpy that accompanies the formation of one mole of a compound from its elements. The standard enthalpy of reaction is the change in enthalpy that occurs in a system when one mole of matter is transformed by a chemical reaction.
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