Practice question
Question
What is the entropy change of the system ( Δ Ssys ) when 1 mol of an ideal gas expands isothermally from 2 L to 4 L? ( R = 8.314 J/mol·K )
Explanation
For isothermal expansion, Δ Ssys = nR ln(V₂/V₁) = 1 × 8.314 × ln(4/2) = 8.314 × 0.6931 ≈ 5.76 J/K .
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