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MCQ

Question

For the vaporization of 72 g of water at 373 K ( Δ Hvap = 40.79 kJ/mol , molar mass = 18 g/mol), what is Δ Ssys ?

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109.4 J/K 437.5 J/K Correct 218.8 J/K 40.79 J/K

Moles = 72 / 18 = 4 mol . For vaporization, Δ Ssys = n × Δ Hvap / T = 4 × 40790 / 373 ≈ 437.48 J/K ≈ 437.5 J/K .

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