Chemistry / Unit 4 Chem 0700 short lesson, about 20 seconds
Standard Enthalpy of Formation
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The idea
A standard enthalpy of formation is the heat change forming one mole of a compound from its elements in standard states.
In practice
Carbon dioxide's standard enthalpy of formation is the change when graphite and oxygen gas combine to form one mole of CO2.
Where people slip
Assigning an element a nonzero formation enthalpy in some other form, rather than its stable standard state, breaks the reference.
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