Correct Answer: Gibbs free energy indicates the maximum reversible work that can be performed by a thermodynamic system at constant temperature and pressure.
Step 1: Understand that Gibbs free energy is a concept in thermodynamics.
Step 2: Recognize that it helps us understand energy changes in a system.
Step 3: Know that it measures the maximum work that can be done by the system.
Step 4: Remember that this measurement is taken when the temperature and pressure are constant.
Step 5: Conclude that Gibbs free energy is important for predicting if a reaction can occur spontaneously.
