Free Energy Change

$$\Delta G = G_{final} - G_{initial} = G_{products} - G_{reactants}$$ $$= \Delta G^{\circ} + \left(\ R * T * ln\left(\ \frac{[C]^c*[D]^d}{[A]^a*[B]^b} \ \right) \ \right)$$ $$= \Delta G^{\circ} + \left(\ R * T * ln(\ Q\ ) \ \right)$$

The free energy change of a chemical reaction $(\Delta G)$ depends on:

• the standard free energy change $(\Delta G^{\circ})$ which uses the equilibrium state as a reference
• the concentrations of the reactants and products ( described by: $R * T * ln( Q )$ )

When the system is at equilibrium , $\Delta G = 0$