What is Gibb's Helmholtz equation? Explain with the help of applications.

The equation ˆ†GT, P = ˆ†H – Tˆ†S is known as Gibbs Helmholtz equation and it is used for predicting the spontaneity of a process.
Following are the applications of the Gibbs-Helmholtz equation:

  1. Used in the calculation of the change in enthalpy using the change in Gibbs energy when the temperature is varied at constant pressure.
  2. Used in the calculation of the change in enthalpy for a reaction with temperature other than 298K.
  3. Used in the calculation of the effect of temperature change on the equilibrium constant.

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