Which of the following reactions will have a negative ΔG at high temperatures?

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Question: Which of the following reactions will have a negative ΔG at high temperatures?

Options:

Correct Answer: Endothermic reactions with positive ΔS

Solution:

Endothermic reactions with positive ΔS can have a negative ΔG at high temperatures due to the TΔS term becoming significant.

Which of the following reactions will have a negative ΔG at high temperatures?

Which of the following reactions will have a negative ΔG at high temperatures?

Step 1: Understand what ΔG means. ΔG is the change in free energy of a reaction. A negative ΔG means the reaction is spontaneous.
Step 2: Know the formula for ΔG: ΔG = ΔH - TΔS, where ΔH is the change in enthalpy, T is the temperature in Kelvin, and ΔS is the change in entropy.
Step 3: Identify what endothermic means. An endothermic reaction has a positive ΔH, meaning it absorbs heat.
Step 4: Recognize that ΔS can be positive or negative. A positive ΔS means the disorder of the system increases.
Step 5: At high temperatures, the TΔS term becomes larger. If ΔS is positive, TΔS will also be positive and can outweigh the positive ΔH.
Step 6: Conclude that if a reaction is endothermic (positive ΔH) and has a positive ΔS, then at high temperatures, TΔS can make ΔG negative.

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