Question

Distinguish between ΔG^0', ΔG⁰, ΔG, and G_f⁰.

Answer 1

G_f⁰ => Standard Gibbs free energy for formation.

ΔG⁰ => Change in standard Gibbs free energy​. This is the free energy at 298 K.

ΔG => ΔG = ΔG⁰ + RT ln K

Where ΔG is the change in free energy

R = gas constant

T = temperature of the reaction

K = equilibrium constant for the reaction.

At equilibrium, ΔG = 0

So, ΔG⁰ = - RT ln K

ΔG⁰' = Change in standard Gibbs free energy corresponding to an apparent equilibrium constant.

Suppose one of the concentration of the reactant is kept constant, and other are changed. So, equilibrium constant can be found apparent and is K'.

ΔG⁰' = - RT ln K'