Which of the following statements about equilibrium are true?
I. $\Delta$ G_sys = 0
II. $\Delta$ S_sys = 0
III. $\Delta$ S_universe = 0

Question

Which of the following statements about equilibrium are true? I.$\Delta$G_sys = 0 II.$\Delta$S_sys = 0 III.$\Delta$S_universe = 0

Quizplus · Accepted Answer

Statement I is the expression for the Gibbs free energy change of the system and is true at equilibrium. 
Statement II is the expression for the entropy change of the system and its surroundings and is also true at equilibrium. 
Statement III is the expression for the entropy change of the universe and is therefore always true. However, it is not specific to equilibrium and can be true even when the system is not at equilibrium. Therefore, only statements I and II specifically refer to the conditions of equilibrium.

Which of the Following Statements About Equilibrium Are True? I Δ\DeltaΔ

Which of the Following Statements About Equilibrium Are True?
I $\Delta$