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Standard reaction enthalpy is when the reactants and products in a reaction are in their standard state at 1 atm. Standard enthalpy of formation is the standard reaction enthalpy for the formation of one mole of a substance from its element in their most stable form.
The standard enthalpy change of formation of a compound is the enthalpy change which occurs when one mole of the compound is formed from its elements under standard conditions, and with everything in its standard state. However, the standard enthalpy change of a reaction is the enthalpy change which occurs when equation quantities of materials react under standard conditions, and with everything in its standard state.
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