Chemistry · THERMODYNAMICS

At dynamic chemical equilibrium for the reaction \( A + B \rightleftharpoons C + D \), what is the criterion for the Gibbs energy of the reacting mixture?

1. A
   Gibbs energy of the system reaches its maximum value
2. B
   Gibbs energy of the system is equal to the total enthalpy
3. C
   Gibbs energy of the system is infinite
4. D
   Gibbs energy of the system is minimum and \( \Delta_r G = 0 \)