Free energy___________________?
Correct answer: D. All A, B. and C
- A. Decreases in all spontaneous (or irreversible) processes
- B. Change during a spontaneous process has a negative value
- C. Remains unchanged in reversible processes carried at constant temperature and pressure
- D. All A, B. and C
Explanation
A suitable free energy decreases for an irreversible spontaneous change and remains constant for a reversible change at the relevant fixed conditions. In particular, ΔG is negative for a spontaneous constant-temperature, constant-pressure process and zero for a reversible one, so all three statements are intended to apply.
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