# 09 - Chapter 10 For an isothermal process reversible...

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Unformatted text preview: 10/13/09 Chapter 10 For an isothermal process, reversible process, ∆S=q rev /T Phase Transitions Fusion (melting): solid liquid liquid solid Vaporization liquid gas gas liquid q p =∆H ∆S fusion =∆H fusion /T f ∆S vap =∆H vap /T v We can determine the differences in the entropies of states in the same manner as we determined differences in ∆E and ∆H Entropies are unique in that the absolute values of entropies can be determined 1 st we must understand how entropies change with T For an isothermal reversible process: ∆Ssystem=qrev/T qrev=T∆S qp=∆H=nCp∆T qv=∆E=nCp∆T Calculate ∆S for a temperature change (T1 T2) ∆S=nCp∆T/T ∆S=nCv∆T/t ∆S=nCpln(T1/T2) ∆S=nCvln(T1/T2) Unlike H and E, we know the value of the absolute entropies of all substances at one temperature 0 K 3 rd Law of Thermodynamics: the entropy of an ideal crystal at 0 K is zero The degree of vibration is a function of the energy available to the crystal The degree of vibration is a function of the energy available to the crystal...
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09 - Chapter 10 For an isothermal process reversible...

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