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The standard enthalpy of formation is the change in enthalpy that accompanies the formation of one mole of the compound from its elements. The standard enthalpy of reaction occurs in a system when one mole of matter is transformed by a chemical reaction.
The difference between standard reaction enthalpy and standard enthalpy of formation is that the standard enthalpy of formation is for a substance in its standard state (or in the element's most stable form) whereas standard reaction enthalpy by itself doesn't specific the phase of the substance.
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