03. Enthalpy Changes in Chemical Reactions

  1. Standard enthalpy of combustion, ΔH°c

  • Start with 1 mole

  • Oxygen is in excess so can be any number

  • Ends with CO₂(g) + H₂O(l)

  • Must balance equation completely so first reactant that isn’t oxygen starts with 1 mole and has no big number

  1. Standard enthalpy of formation, ΔH°f

  • Must finish with 1 mole

  • Reactants must be each element separately

  • Balanced