Question

The maximum work obtained from a reversible process is given as:

• A. \( -\Delta A \)
• B. \( \Delta A \)
• C. \( -\Delta G \)
• D. \( \Delta G \)

Hint:

At constant \(T, V\): \( -\Delta A = \) maximum work
At constant \(T, P\): \( -\Delta G = \) maximum useful work

Answer 1

The Correct Option is A

Concept:
•Helmholtz free energy (\(A\)) is used for processes at constant temperature and volume.
•The decrease in Helmholtz free energy gives the maximum work obtainable. \[ \Delta A = -W_{\text{max}} \]

Step 1: Condition For a reversible process at constant temperature and volume: \[ W_{\text{max}} = -\Delta A \]

Step 2: Conclusion \[ -\Delta A \]