华东理工大学：物理化学（中英文） 5. The Second Law: the machinery

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n this chapter First: to find relations between properties that might not be thought to be related to derive expressions for the variation of the g with Tand p Second: to introduce the chemical potential, a property that will be at the center of discussions in the remaining chapters of this part of the text; to derive expression of fugacity

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5. The second law: the machinery s chapter First: to find relations between properties that might not be thought to be related to derive expressions for the variation of the g with Tand p Second: to introduce the chemical potential, a property that will be at the center of discussions in the remaining chapters of this part of the text; to derive expression of vacity The 'chemical potential, the quantity on which almost all the most important applications of thermodynamics to chemistry are based 版权所有:华东理工大学物理化学教研

版权所有：华东理工大学物理化学教研室 3 In this chapter: First: to find relations between properties that might not be thought to be related; to derive expressions for the variation of the G with T and p. Second: to introduce the chemical potential, a property that will be at the center of discussions in the remaining chapters of this part of the text; to derive expression of fugacity. The 'chemical potential', the quantity on which almost all the most important applications of thermodynamics to chemistry are based. 5. The Second Law: the machinery

5. The second law: the machinery Combing the First and second Laws 5.1 Properties of the internal energy 5.2 Properties of the gibbs energy 5.3 The chemical potential of a pure substance Real gases: the fugacity 5.4 The definition of fugacity 5.5 Standard states of real gases 5.6 The relation between fugacity and pressure 版权所有:华东理工大学物理化学教研

版权所有：华东理工大学物理化学教研室 4 Combing the First and Second Laws 5.1 Properties of the internal energy 5.2 Properties of the Gibbs energy 5.3 The chemical potential of a pure substance Real gases:the fugacity 5.4 The definition of fugacity 5.5 Standard states of real gases 5.6 The relation between fugacity and pressure 5. The Second Law: the machinery

p The fundamental equations Five state functions in the first and second laws The internal energy H The entropy: S The enthalpy: H P U The Helmholtz energy: A The gibbs energy: G P TS H=U+pV A=0-TS G AS G=H-TS= U+py-TS=A+pV 版权所有:华东理工大学物理化学教研

版权所有：华东理工大学物理化学教研室 5 The fundamental equations Five state functions in the First and Second Laws: The internal energy: U The entropy: S The enthalpy: H The Helmholtz energy: A The Gibbs energy: G H pV U pV A TS G TS H=U+pV A=U-TS G= H-TS = U+pV-TS =A+pV

p The fundamental equations The First Law: dU=dg+dw H For a reversible change in a composition, and in the pl closed system of constant absence of any non-expansion P A TS work d w=-pdy and dq =tds G TS du=Tds -pdv dv is an exact differential, its value is independent of pa 版权所有:华东理工大学物理化学教研

版权所有：华东理工大学物理化学教研室 6 The First Law: dU =dq+dw H pV U pV A TS G TS For a reversible change in a closed system of constant composition, and in the absence of any non-expansion work: d w = -pdV and dq =TdS dU=TdS-pdV dU is an exact differential, its value is independent of path. The fundamental equations

p The fundamental equations H=U+p, A=0-TS, G=U+pV-TS dh= dU+ pdy+ vd Pv U = (dS pd)+pdv+ vdp y A TS Tds +yd G IS dg= dU+pdv+ vdp -tds- sdT (TdS pdn)+pd+ vdp-TdS- SdT -vdp -sdT da= dU-Tds-SdT =(d pdv)-TdS- SdT pdv-sdT 版权所有:华东理工大学物理化学教研

版权所有：华东理工大学物理化学教研室 7 H pV U pV A TS G TS dH = dU+ pdV + Vdp =(TdS-pdV)+ pdV + V dp H=U+pV, A=U-TS, G=U+pV-TS dA= dU-TdS-SdT = (TdS -pdV) -TdS- SdT dG = dU+pdV+ Vdp –TdS- SdT = (TdS-pdV) +pdV+ Vdp –TdS- SdT = TdS +V dp = Vdp -SdT = -p dV -SdT The fundamental equations

版权所有：华东理工大学物理化学教研室 9 5.1 Properties of the internal energy 1). The Maxwell relations = gdx + hdy z = f (x, y) y y z x x z z y x d d d            +        = y x y z h x z g            =        where =

版权所有：华东理工大学物理化学教研室 10 1). The Maxwell relations x y z y g x    =           2 y x z x h y     =        2 x y x h y g         =           dz = gdx + hdy The first derivative of g with respect to y, and h to x 5.1 Properties of the internal energy

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