The change in free energy that occurs when a compound is formed form its elements in their most thermodynamically stable states at standard-state conditions.Click to see full answer. Then, what is meant by free energy change?The change in the free energy is the maximum amount of work that a thermodynamic system can perform in a process at constant temperature, and its sign indicates whether a process is thermodynamically favorable or forbidden.Also Know, what is free energy change in chemical reaction? If the free energy of the reactants is greater than that of the products, the entropy of the world will increase when the reaction takes place as written, and so the reaction will tend to take place spontaneously. If the free energy of the products exceeds that of the reactants, then the reaction will not take place. Hereof, what do you mean by free energy? In physics and physical chemistry, free energy refers to the amount of internal energy of a thermodynamic system that is available to perform work. Helmholtz free energy is energy that may be converted into work at constant temperature and volume.How do you calculate free energy change?Gibbs free energy, denoted G, combines enthalpy and entropy into a single value. The change in free energy, ΔG, is equal to the sum of the enthalpy plus the product of the temperature and entropy of the system.