Practice question
Question
What is the entropy change (Δ S) for the vaporization of 18 g of water at 373 K if Δ Hvap = 40.79 kJ/mol? (Molar mass of H₂O = 18 g/mol)
Explanation
Moles = 18 / 18 = 1 mol, Δ S = Δ Hvap / T = 40.79 × 10³ / 373 = 109.36 J/K·mol.
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