"The Gibbs free energy (or Gibbs energy as the recommended name) is a thermodynamic potential that can be used to calculate the maximum amount of work, other than pressure-volume work, that may be performed by a thermodynamically closed system at constant temperature and pressure."
A state function that combines and balances the enthalpy and entropy of a system. It can be used to determine the spontaneity of a reaction at constant temperature and pressure, and is defined as G = H - TS.
Thermodynamic systems and surroundings: This topic defines the thermodynamic system and its surroundings and provides a foundation for understanding how they interact.
Internal energy: This topic discusses the internal energy of a system and the relationship between the internal energy and other thermodynamic quantities.
Work and heat: This topic explores the work and heat exchanged between the system and surroundings.
First law of thermodynamics: This topic explains the relationship between the internal energy, work, and heat.
Enthalpy: This topic defines enthalpy and its relationship with other thermodynamic quantities.
Second law of thermodynamics: This topic explains the limitations of converting heat into work and the concept of entropy.
Entropy: This topic provides a definition of entropy, its role in thermodynamics, and its relationship with other thermodynamic quantities.
Free energy: This topic defines the free energy of a system and provides an understanding of how it relates to the first and second law of thermodynamics.
Types of free energy: This topic covers the different types of free energy including Helmholtz and Gibbs free energy.
Gibbs-Helmholtz equation: This topic explores the mathematical relationship between Gibbs and Helmholtz free energy.
Standard free energy change: This topic defines the standard free energy change and its relationship with the equilibrium constant.
Spontaneity: This topic discusses the concept of spontaneity and the factors that determine whether a reaction is spontaneous.
Equilibrium: This topic explains the concept of equilibrium and how it relates to the free energy change.
Gibbs free energy and equilibrium constant: This topic explores the mathematical relationship between Gibbs free energy and the equilibrium constant.
Applications of Gibbs free energy: This topic covers some of the practical applications of Gibbs free energy including chemical reactions and phase changes.
Standard Gibbs Free Energy (delta G°): This is the Gibbs Free Energy change that occurs under standard conditions. Standard conditions refer to a temperature of 298K (25°C), a pressure of 1 bar, and a concentration of 1 Molar for all reactants and products. It is useful in comparing the relative stability of different compounds or molecules.
Reaction Gibbs Free Energy (delta G): This is the Gibbs Free Energy change that occurs under non-standard conditions. It takes into account the temperature, pressure and concentrations of the reactants and products. This value helps to determine whether a reaction is spontaneous or non-spontaneous.
Excess Gibbs Free Energy (Gex): This is the difference between the Gibbs Free Energy of the mixture and the Gibbs Free Energy of the pure solvent. It is a measure of the deviation from ideal behaviour of the solution.
Partial Molar Gibbs Free Energy (Gi): This is the Gibbs Free Energy of one mole of a particular component in a mixture, at a constant temperature and pressure. It is useful in determining how the Gibbs Free Energy changes as the concentration of a particular component changes.