Chemistry Thermodynamics Thermochemistry

The heat of formation (enthalpy of formation) of a compound is

1
The heat change when the compound is formed from its elements in their standard states
2
The heat change when 1 g of the compound is formed from its elements in their standard states
3
The sum of the bond energies in the molecule
4
The heat change when 1 mole of the compound is formed form its elements in their standard states

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