Question

What is ΔSsys for a boiling phase transition at 105.5 °C for a compound that boils at 105.5 °C and the ΔHsys = 69.9 kJ mol-1 for this process? Express your answer in J mol-1 K-1.

Answer 1

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For Bolling phase transition ; at constant temperature To and constant 8. (H = d'Quen = enthalby fou phase change. As ayon = | ciones = f a arom Du Dusym = 69. 4 kj molt = 69.9 X 10 35001 - To = 105.5°C = (105.5 +2+3.15 ) k TB = 378.65k Putting in aboue equation , we have Sym = 69.9 x 103 Imolt Issym = 0.18 460 X 103 Jmork- Assym = 184.6 JMo1-/x-

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