35-entropy - Entropy & Physical Changes E n tr o p y is...

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1 Week 15 CHEM 1310 - Sections L and M 1 Entropy & Physical Changes Entropy is dependent on temperature S = k B ln S = q rev / T 1 2 1 2 2 1 2 1 ln at constant Pressure ln at constant Volume T T p T T V T S nC T T S nC T Æ Æ Ê ˆ D = Á ˜ Ë ¯ Ê ˆ D = Á ˜ Ë ¯ Show explanation on board: Week 15 CHEM 1310 - Sections L and M 2 Entropy & Physical Changes Entropy changes are also associated with changes in phase fus rev H q S T T D D = = Calculate the change in entropy that occurs when a sample containing 1.00 mol of ice is heated from –20°C to +20°C at 1 atm pressure. The molar heat capacities of H 2 O(s) and H 2 O(l) are 38.1 JK -1 mol -1 and 75.3 J K -1 mol -1 respectively and the enthalpy of fusion (melting) is 6.01 kJ mol -1 at 0°C. Show on board Week 15 CHEM 1310 - Sections L and M 3 • Use calorimetry • Measure c p vs T • Deduce molar absolute entropy – J K -1 mol -1 • If phase change occurs from 0 T, then add Δ S of phase transition Δ S vap = Δ H vap T b Example Measuring Entropy
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2 4 S º increases are you read down a Group.
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35-entropy - Entropy & Physical Changes E n tr o p y is...

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