Question Detail

CHM 101 CHM 101 Past Questions Objective Question

Question

When a reaction is non-spontaneous under standard conditions, what could make it spontaneous?
Options
A Decreasing pressure
B Increasing temperature (if ΔS > 0)
Correct Answer
C Adding more reactants
D Making ΔH more positive
Correct Answer

Option B is the correct answer.

Detailed Explanation

From ΔG = ΔH - TΔS, if ΔS is positive, increasing the temperature T increases the magnitude of the -TΔS term. If this term becomes sufficiently large to make the overall ΔG negative, the reaction can become spontaneous.

Hint

Manipulate the Gibbs free energy equation. Which term is temperature-dependent, and how does its sign affect spontaneity?

Question Info