This statement can be generalized to other extensive properties, such as in the Bordwell thermodynamic cycle. When applying this law, one needs to know standard values for the property in question, which is -105 kilojoules per mole for propane. By comparing the standard enthalpy change of formation to the enthalpy required to make gaseous ions, this statement can be used to calculate the lattice energy in the Born-Haber cycle. It is also known as "the law of constant heat summation". For 10 points, name this law stating that the total enthalpy 
This statement can be generalized to other extensive properties, such as in the Bordwell thermodynamic cycle. When applying this law, one needs to know standard values for the property in question, which is -105 kilojoules per mole for propane. By comparing the standard enthalpy change of formation to the enthalpy required to make gaseous ions, this statement can be used to calculate the lattice energy in the Born-Haber cycle. It is also known as "the law of constant heat summation". For 10 points, name this law stating that the total enthalpy change of a reaction is the same regardless of the steps taken in completing the reaction, named for a Russian chemist.
This statement can be generalized to other extensive properties, such as in the Bordwell thermodynamic cycle.
{Hess}’s law