What is meant by free energy of a system ? What will be the direction of the chemical reaction when (i) `Delta G = 0` (ii) `Delta G gt 0` (iii) `Delta G lt 0` ?

Explanation

Free energy is defined as the energy which can be converted into useful work.
(i) `Delta G = 0`, the reaction will be in equilibrium
(ii) `Delta G gt 0`, the reaction will not take place.
(iii) `Delta G lt 0`, the reaction will be spontaneous.