Gibb's free energy (6) Work function.
Answers
Answer:
Gibbs free energy, also known as the Gibbs function, Gibbs energy, or free enthalpy, is a quantity that is used to measure the maximum amount of work done in a thermodynamic system when the temperature and pressure are kept constant. Gibbs free energy is denoted by the symbol ‘G’. Its value is usually expressed in Joules or Kilojoules. Gibbs free energy can be defined as the maximum amount of work that can be extracted from a closed system.
This property was determined by American scientist Josiah Willard Gibbs in the year 1876 when he was conducting experiments to predict the behaviour of systems when combined together or whether a process could occur simultaneously and spontaneously. Gibbs free energy was also previously known as “available energy.” It can be visualized as the amount of useful energy present in a thermodynamic system that can be utilized to perform some work.
Gibbs Free Energy
Standard Free Energy Changes
The standard Gibbs Free Energy is calculated using the free energy of formation of each component of a reaction at standard pressure.
Explanation:
Variations of the Equation
Gibbs free energy is a state function hence it doesn’t depend on the path. So change in Gibbs free energy is equal to the change in enthalpy minus the product of temperature and entropy change of the system.
ΔG = ΔH – Δ(TS)
If the reaction is carried out under constant temperature{ΔT=O}
ΔG = ΔH – TΔS
This equation is called the Gibbs Helmholtz equation.
ΔG > 0; the reaction is non-spontaneous and endergonic
ΔG < 0; the reaction is spontaneous and exergonic
ΔG = 0; reaction is at equilibrium