Practice question
Question
Calculate Δ Ssys for the condensation of 1 mol of ethanol at 351 K. ( Δ Hvap = 38.6 kJ/mol )
Explanation
For C₂H₅OH(g) → C₂H₅OH(l) , Δ Ssys = -(Δ Hvap/T) = -(38.6 × 10³/351) ≈ -110.0 J/K·mol , as condensation decreases entropy.
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