Answer
The change in Gibbs free energy for a process is proportional to the negative $\Delta$S$_{univ}$. $\Delta$G is also a criterion for spontaneity (although with an opposite sign) because $\Delta$S$_{unit}$ is a criterion for spontaneity.
Work Step by Step
The change in Gibbs free energy for a process is proportional to the negative $\Delta$S$_{univ}$. $\Delta$G is also a criterion for spontaneity (although with an opposite sign) because $\Delta$S$_{univ}$ is a criterion for spontaneity.
