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Bond enthalpy is the change in energy of a certain bond when broken or formed, not being strict about the form of the reactants or products. Standard enthalpy is the change in energy when all reactants and products are in their "standard state", meaning they are at 1 atmosphere, and 1 molar for a solution, or a pure solid or liquid. Standard enthalpy of formation is the standard enthalpy for the formation of one mole of a substance from its elements in their most stable form.
Yea so essentially: standard enthalpies are the change of enthalpy during the formation of 1 M of the substance from its elements needed to make it, but bond enthalpies are the amount of energy required to break bonds. How I remember it is bond is B for break, and standard is s for synthesize.
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