If a chemical reaction is exothermic but not spontaneous,which of the following must be true? A) Δ_rG 0,Δ_rS 0,and Δ_rH 0 B) Δ_rG 0,and Δ_rH 0 C) Δ_rG 0,Δ_rS 0 D) Δ_rG

Question

If a chemical reaction is exothermic but not spontaneous,which of the following must be true? A) Δ_rG > 0,Δ_rS > 0,and Δ_rH > 0 B) Δ_rG < 0,Δ_rS > 0,and Δ_rH > 0 C) Δ_rG > 0,Δ_rS < 0,and Δ_rH > 0 D) Δ_rG < 0,Δ_rS < 0,and Δ_rH < 0 E) Δ_rG > 0,Δ_rS < 0,and Δ_rH < 0

Quizplus · Accepted Answer

An exothermic reaction has Δ_rH < 0. If it is not spontaneous, Δ_rG > 0. For Δ_rG to be positive, Δ_rS must be negative when Δ_rH is negative.

If a Chemical Reaction Is Exothermic but Not Spontaneous,which of the Following