# Gibbs Free Energy

MichaelBartmess.Gibbs Free Energy

The equation defines the **Gibbs Free Energy **of reaction, which is analogous to potential energy defining the process-initiating work available to trigger a reaction. As such it is defined in units of energy / amount of substance (J/mol).

`Delta _G=-R * T * ln (K_a)`

- R = ideal gas constant
- T = temperature (Kelvin)
- `K_a` = natural log of the reaction quotient

# Notes

A most important thermodynamic property is one termed the "free energy of a reaction" also called the change in Gibbs Free Energy (`Delta_G`). Gibbs energy is defined as the chemical potential that is minimized when a system reaches equilibrium at constant pressure and temperature. The Gibbs Free Energy in this definition is the state in which a process can occur while maintaining constant pressure and temperature. Understanding the free energy of a reaction allows one to determine under what conditions a chemical or biological reaction will proceed, the state of equilibrium and how to compute the equilibrium constant (`K_eq`) of the reaction.

**Gibbs Free Energy**, references 1 equation/constant.

**Equations and Constants **