Gibbs Free Energy (G) is a thermodynamic property of great importance defined by the expression:
G = H - TS. Enthalpy (H) is the maximum energy that a system can have at a particular state and the energy (TS) is the energy that has to be rejected to surrounding according to the 2nd law of thermodynamics. Therefore G represents the maximum usable energy that we can extract from the system at constant temperature and pressure.
G = H - TS. Enthalpy (H) is the maximum energy that a system can have at a particular state and the energy (TS) is the energy that has to be rejected to surrounding according to the 2nd law of thermodynamics. Therefore G represents the maximum usable energy that we can extract from the system at constant temperature and pressure.
For
an open system the differential form of Gibbs free energy having its
variables pressure and temperature are easily measured and controllable.
Most chemical reactions occur at constant temperature and pressure. The
partial molar Gibbs free energy has a special name i.e. chemical
potential.
The other properties can also be expressed in terms of Gibbs free energy. Therefore, it is also termed as generating function.
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