Which reaction is spontaneous at all temperatures according to Gibbs free energy equation (Delta G = Delta H - T Delta S)?

Answer and explanation

Correct answer: D. a reaction with negative enthalpy change (Delta H < 0) and positive entropy change (Delta S > 0)

  1. Step 1: Delta G = Delta H - TDelta S. Step 2. If Delta H < 0 and Delta S > 0, then -TDelta S is always negative, making Delta G strictly negative at all positive absolute temperatures. Answer: a reaction with negative enthalpy change (Delta H < 0) and positive entropy change (Delta S > 0). Why not the others: Delta H > 0 and Delta S < 0 is non-spontaneous at all temperatures.

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