Question: In which scenario would ΔG be equal to ΔH?
Options:
At absolute zero.
When ΔS = 0.
For a spontaneous reaction.
For an endothermic reaction.
Correct Answer: When ΔS = 0.
Solution:
ΔG equals ΔH when the entropy change (ΔS) is zero, indicating no change in disorder.
In which scenario would ΔG be equal to ΔH?
Practice Questions
Q1
In which scenario would ΔG be equal to ΔH?
At absolute zero.
When ΔS = 0.
For a spontaneous reaction.
For an endothermic reaction.
Questions & Step-by-Step Solutions
In which scenario would ΔG be equal to ΔH?
Step 1: Understand what ΔG means. ΔG is the change in free energy of a system.
Step 2: Understand what ΔH means. ΔH is the change in enthalpy, or total heat content, of a system.
Step 3: Know what ΔS means. ΔS is the change in entropy, which measures the disorder or randomness in a system.
Step 4: Recognize the relationship between ΔG, ΔH, and ΔS. The equation is ΔG = ΔH - TΔS, where T is the temperature in Kelvin.
Step 5: Identify when ΔG equals ΔH. This happens when ΔS is zero, meaning there is no change in disorder.
Step 6: Conclude that if there is no change in disorder (ΔS = 0), then ΔG will equal ΔH.
Gibbs Free Energy and Enthalpy – ΔG (Gibbs Free Energy) is a measure of the spontaneity of a process, while ΔH (Enthalpy) represents the heat content. Their relationship is influenced by entropy (ΔS).
Entropy Change – Entropy (ΔS) is a measure of disorder in a system. When ΔS is zero, it indicates that there is no change in disorder, leading to ΔG equaling ΔH.
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