Practice question
Question
Calculate Δ Stotal when 1 mol of a liquid vaporizes at 400 K if Δ Hvap = 35 kJ/mol.
Explanation
Δ Ssys = Δ Hvap / T = 35 × 10³ / 400 = 87.5 J/K, Δ Ssurr = -Δ H / T = -35 × 10³ / 400 = -87.5 J/K, Δ Stotal = 87.5 - 87.5 = 0 J/K.
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