For 10 points, name this law in thermochemistry named for a Swiss-born Russian chemist.
This law can be used to calculate the acidity of the hydrohelium ion. This law can be used to find lattice energy in a process involving the formation of an ionic solid from a metal and a non-metal, called the Born-Haber Cycle. Since the quantity it concerns is a state function, this law is also equal to the differences in the [*] enthalpies of the products and the reactants. Also called the "law of constant heat summation," this law states that the enthalpy of a reaction is equal to the sum of the enthalpies of the individual steps of the reaction. For 10 points, name this law in thermochemistry named for a Swiss-born Russian chemist.
This law can be used to calculate the acidity of the hydrohelium ion.
{Hess’s} Law