What is Delta G

Answer: The difference in free energy involved in a chemical reaction is known as delta G (∆G). For any chemical reaction that undergoes a transition, the change in free energy can be calculated.

How to calculate G?

You need to deduct the amount of energy lost to entropy (S) from the systems’ total energy change.

In thermodynamics

G (Gibbs Free energy) is the energy that is used to do work.