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It is the enthalpy change that occurs in a system when one mole of matter is transformed by a chemical reaction under standard conditions.
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 Standard enthalpy of formation is the change in enthalpy when one mole of a substance, in the standard state of 1 atm of pressure and temperature of it is 298.15 K, is formed from its pure elements under the same conditions. Hope it helps. Also vote it the brainliest answer! :)
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