Answer
When Gibbs free energy change ($\Delta$G) is negative, the process is spontaneous.
Work Step by Step
When Gibbs free energy change ($\Delta$G) is negative, the process is spontaneous.
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.