Which thermodynamic quantity, at constant temperature and pressure, determines whether a reaction is spontaneous?
Answer
ΔG
The correct answer is ΔG — Select ΔG as the correct quantity because ΔG < 0 indicates a spontaneous process.
Step-by-step solution
- Recall that spontaneity at constant T and P is governed by the sign of the Gibbs free energy change, ΔG.
- Identify the options: ΔH, ΔS, ΔG, ΔU.
- Select ΔG as the correct quantity because ΔG < 0 indicates a spontaneous process.
Common mistake: Choosing ΔS as the deciding factor
Concept tested: Spontaneity criterion
Published · How this solution was prepared and checked
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