Question

Explain Gibbs free energy change for different conditions.

Answer 1

Gibbs free energy : It is defined as enthalpy of the system minus the product of temperature and the energy of system.

$G=H-TS$.

The change is Gibbs free energy of the system during the reaction is equal to the change in enthalpy minus the product of change of temperature and entropy of the system.

$\Delta G=\Delta H-\Delta \left(TS\right)$

$\Delta G=\Delta H-T\Delta S$ (At const temperature).

If $\Delta G<0$, the reaction is favourable and spontaneous.

If $\Delta G>0$, the reaction is unfavourable and non-spontaneous.