The expression for entropy change given by, ΔS = - nR ln (P2/P1), holds good for___________________?
Correct answer: D. Reversible isothermal volume change
- A. Expansion of a real gas
- B. Cooling of a real gas
- C. Heating of an ideal gas
- D. Reversible isothermal volume change
Explanation
For a reversible isothermal change of an ideal gas, integrating dS = -nR dP/P gives ΔS = -nR ln(P2/P1), equivalently nR ln(V2/V1). Real-gas expansion or cooling does not generally follow this simple expression.
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