Discussion
The actual free energy change of a given biochemical reaction carried out under standard conditions with 1 M initial concentration of each of the reactants and products will be
Answer: B
The actual free energy change is equal to standard free energy change for the reaction.
The actual free energy change is related to the standard value by
\[ \Delta G = \Delta G^{\circ} + RT\ln Q \]
where Q is the ratio of product to reactant concentrations. With every reactant and product at 1 M, Q = 1 and \(\ln 1 = 0\), so \(\Delta G = \Delta G^{\circ}\) at the start of the reaction.
\(\Delta G\) is zero only at equilibrium, when Q equals the equilibrium constant, which these conditions do not describe. It would be less or greater than \(\Delta G^{\circ}\) only if Q were below or above 1.
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