Step 1: Understand what ΔG means. ΔG represents the change in free energy of a system.
Step 2: Know that ΔG can tell us if a reaction will happen or not. If ΔG is negative, the reaction can happen spontaneously. If ΔG is positive, the reaction will not happen spontaneously.
Step 3: Learn about equilibrium. Equilibrium is a state where the concentrations of reactants and products remain constant over time.
Step 4: Realize that at equilibrium, there is no net change in the amounts of reactants and products. This means the forward and reverse reactions are happening at the same rate.
Step 5: Conclude that when a system is at equilibrium, ΔG equals zero. This indicates that the system is stable and there is no driving force for the reaction to proceed in either direction.