• The standard heat of formation is the enthalpy change associated with the formation of one mole of a compound from its elements in their standard states.
  • The standard state of an element is its state at 25°C and 101.3 kPa.
  • For example, iron is a solid, bromine is a liquid, and oxygen is a gas under those conditions.
  • The graphite form of solid carbon is its standard state with , while diamond is not.
  • Some standard heats of formation are listed in Table below.
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