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Practice question

MCQ

Question

Calculate Δ Ssys when 1 mol of water vaporizes at 373 K. ( Δ Hvap = 40.79 kJ/mol )

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Explanation

For H₂O(l) → H₂O(g) at 373 K, Δ Ssys = (Δ Hvap/T) = (40.79 × 10³/373) = 109.4 J/K , representing the entropy increase due to phase change from liquid to gas.

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