Enthalpy of formation | Thermodynamics | AP Chemistry | Khan Academy

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The standard enthalpy of formation of a compound is the enthalpy change that occurs when 1 mole of the compound is formed from its constituent elements in their standard states. A pure element in its standard state has a standard enthalpy of formation of zero. For any chemical reaction, the standard enthalpy change is the sum of the standard enthalpies of formation of the products minus the sum of the standard enthalpies of formation of the reactants. View more lessons or practice this subject at https://www.khanacademy.org/science/a...

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