Standard Enthalpy of Formation
This video presents the same text shown beside it, spoken and on screen. It adds nothing the text does not say.
State
A standard enthalpy of formation is the heat change forming one mole of a compound from its elements in standard states.
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Carbon dioxide's standard enthalpy of formation is the change when graphite and oxygen gas combine to form one mole of CO2.
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Assigning an element a nonzero formation enthalpy in some other form, rather than its stable standard state, breaks the reference.