Standard Enthalpy of Formation and Reaction
Standard States and Standard Enthalpy Changes
Standard state and standard enthalpy change describe a reference point and change that a system undergoes under standard conditions.
Calculating the Standard Enthalpy Change Directly
Heat released upon a reaction is equal to the standard enthalpy change if reactants and products are at equal temperature and constant pressure.
Hess' law can be used to determine the overall energy required for a chemical reaction.
Heat of Solution
Heat of solution is the energy released or absorbed during dissolution of a substance in a solvent.