Practice question
Question
Calculate Δ Ssys when 2 mol of an ideal gas expands isothermally from 1 atm to 0.25 atm at 300 K. ( R = 8.314 J/mol·K )
Explanation
For isothermal expansion, Δ Ssys = nR ln(P₁/P₂) = 2 × 8.314 × ln(1/0.25) = 16.628 × 1.3863 ≈ 23.0 J/K .
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