Consider this rxn which has a ΔG° = +0.4 kJ/mol. A + B ↔ C + D 1 M A, 1 M B, 0.1 M C and 0.1 M D are added to a container at room temperature. Which of the following statements is true? A) ΔG 0 (i.e., it's positive) D) Cannot be determined from the information provided.

Question

Consider this rxn which has a ΔG° = +0.4 kJ/mol. A + B ↔ C + D 1 M A, 1 M B, 0.1 M C and 0.1 M D are added to a container at room temperature. Which of the following statements is true?
A) ΔG < 0 (i.e., it's negative)
B) ΔG = 0
C) ΔG > 0 (i.e., it's positive)
D) Cannot be determined from the information provided.

Quizplus · Accepted Answer

The reaction quotient Q = [C][D]/[A][B] = (0.1)(0.1)/(1)(1) = 0.01. Since ΔG° is positive, the reaction is not spontaneous under standard conditions. However, because Q < K (where K is the equilibrium constant), the reaction will proceed forward to reach equilibrium, making ΔG negative.

Consider This Rxn Which Has a ΔG° = +0