If a reaction is exothermic and there is a great disorder, it means that

Correct answer: there will be a large decrease in free energy.

Explanation: For spontaneity, use Gibbs free energy: \( \Delta G = \Delta H - T\Delta S \).

• Exothermic ⇒ \( \Delta H < 0 \)
• Great disorder ⇒ \( \Delta S > 0 \)
• Thus \( \Delta G = (\text{negative}) - T(\text{positive}) \) ⇒ more negative ⇒ large decrease in free energy.

• Static / equilibrium — Not implied; equilibrium requires \( \Delta G = 0 \).
• Large increase in free energy — Opposite of exothermic with increased entropy.