# How can I draw a Hess's law diagram?

Dec 12, 2015

See explanation.

#### Explanation:

Let us consider the following example of Hess's law to find the energy of the following reaction:

$L i \left(s\right) + \frac{1}{2} {F}_{2} \left(g\right) \to L i F \left(s\right)$

This reaction is the sum of the individual reactions given in the below table and the energy of the reaction in question it would be the sum of energies of all reactions:

Writing the energy diagram of Hess's law should represent the different energies of the individual steps on the energy scale taking into consideration the order followed in the table above.

The Hess's law digram would then be:

I hope this helps.

$\textcolor{g r a y}{\text{Images source: Zumdahl textbook 9th edition}}$