Practice question
Question
Calculate the entropy change (Δ S) when 1 mol of an ideal gas is compressed isothermally from 20 L to 5 L at 400 K. (R = 8.314 J/mol·K)
Explanation
Δ S = nR ln(V₂/V₁) = 1 × 8.314 × ln(5/20) = 8.314 × ln(0.25) = 8.314 × (-1.386) = -11.52 J/K.
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