Quick Biochemistry - Carbohydrates And Carbohydrate Metabolism (Section 6 - No. 12)

Regarding the change in free energy (AG), which statement is accurate?

It directly relates to the standard free energy change (AG)

It is zero at equilibrium

It is only calculable when reactants and products are at 1 mol/L concentrations

It is equal to -RT multiplied by the equilibrium constant (keq)