# What is Hess's law?

##### 1 Answer
Apr 16, 2016

A restatement of the principle of conservation of energy.

#### Explanation:

Hess' law of heat summation states that the enthalpy change of a chemical reaction depends upon the initial and final states of the chemical reaction, and is independent of path.

Another way of saying this is:

$\text{TANSTAAFL, There Ain't No Such Thing As A Free Lunch}$