Lec-03-Chap05-3-Complete

Lec-03-Chap05-3-Complete - Lec-03-Chap06-3-Complete.ppt...

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Lec-03-Chap06-3-Complete.ppt 9/9/2011 Thermochemistry Physical Transformations. Phase Changes 1 Email questions should be submitted to che132@notes.cc.sunysb.edu . Emails sent to instructors’ personal accounts may be lost . 1 Lec-03: Chemical Thermodynamics Chapter 5 - Continued Deadlines for online quizzes will be on Sat. at 11:00 PM Extensive and Intensive Properties Extensive Properties: their value is proportional to the amount of substance present in the sample. Examples are mass ,volume ,internal energy ,enthalpy , . m V E H etc 2 Intensive Properties: their value is independent of the amount of substance present in the sample. Examples are temperature ,pressure ,density , . T P d etc Notice that by taking the ratio of two extensive properties we obtain an intensive property: m d V mass(extensive) density(intensive) volume(extensive)
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Lec-03-Chap06-3-Complete.ppt 9/9/2011 Thermochemistry Physical Transformations. Phase Changes 2 Heat Capacity (at constant pressure) Heat capacity: heat exchanged by the system per unit change in its temperature under constant external pressure : 0 is an extensive property; energy it has units of temperat C u J e , , r p p p q H C T C T       specific extensive molar per unit mass per mol intensive intensive p p s p m C n c T c T q T    More convenient are the specific c s or the molar c p heat capacities 3 Heat Capacity (at constant pressure) - continued The specific heat capacity is defined as 0 J heat capacity per unit mass, kg C p s C c m The molar heat capacity is defined as 0 J heat capacity per mol, mol C p p C c n Recall that molar mass mass ps m
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Lec-03-Chap05-3-Complete - Lec-03-Chap06-3-Complete.ppt...

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