Practice question
Question
Calculate Δ Ssys for the vaporization of 36 g of ethanol at 351 K if Δ Hvap = 38.6 kJ/mol . (Molar mass of C₂H₅OH = 46.07 g/mol )
Explanation
Moles = 36 / 46.07 ≈ 0.7812 mol . For vaporization, Δ Ssys = n × Δ Hvap / T = 0.7812 × 38.6 × 10³ / 351 ≈ 86.0 J/K .
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