Standard Free energy Change

Standard Free energy Change is a process at a specified temperature in which the reactants in their standard state converted into a product in standard states. It may also be defined as the free energy change for a process at 2980K in which the reactants and products are in their standard states. It is denoted by 1G0.

It is the formation of a compound that is defined as the free energy change when one mole of a compound is formed from its constituent's elements.

It also of a substance represents the energy change associated with the formation of the substance from the elements in their most stable forms as they exist under standard conditions.

Combine the standard enthalpy of formation and the standard entropy of a substance to get its standard free energy of formation.

It is especially important in the case of free energy, so take a moment to review it. For most practical purposes, the following definitions of standard states are acceptable:

• Gases: 1-atmosphere partial pressure.
• Pure liquids: the liquid under a total pressure of 1 atm.
• Solutes: an effective concentration of 1 Molar.
• Solids: the pure solid under 1 atm pressure.