Predict the sign of ∆G for an endothermic reaction with a decrease in entropy.
A) positive
B) negative
C) no change
D) cannot predict without additional information

Question

Quizplus · Accepted Answer

Endothermic reactions have a positive ∆H, and a decrease in entropy (S) also results in a negative ∆S value. The equation for ∆G is ∆G = ∆H – T∆S, where T is temperature in kelvin. As ∆H is positive and ∆S is negative, the value of the product T∆S will also be negative. If the magnitude of T∆S is smaller than ∆H, then ∆G is positive, indicating a non-spontaneous reaction. Therefore, the answer is A.

Predict the Sign of ∆G for an Endothermic Reaction with a Decrease