CHM 2046C Sample Module 13 Name: ___Sample_____

Part D: Derivation of Gibbs Free Energy Change & Discussion: 10 points

The quantity called the Gibbs free-energy change (∆G),

∆G = ∆H - T∆S, determines whether a chemical or physical process will occur spontaneously. Fill in the following:

∆G < 0 Process is _______________________________________________

∆G = 0 Process is _______________________________________________

∆G > 0 Process is _______________________________________________

This quantity: ∆G = ∆H - T∆S is derived from the following equation:

∆S^o_universe = ∆S^o_system + ∆S^o_surroundings

Show this derivation with stepwise explanations/comments:

Fill in the following Table to Predict Spontaneity:

∆H

∆S

∆G = ∆H - T∆S

Reaction Spontaneity-include temperatures