文档介绍：Physical Chemistry
Cheng Xuan
February 2004, Spring Semester
Physical Chemistry
Physical Chemistry
Review from the last class
Material Equilibrium
Basic Equations
H U + PV
()*
A U – TS
()*
G H - TS
()*
dU = TdS - PdV
()*
closed syst., rev. proc., P-V work only
()*
closed syst., in equilib., P-V work only
()*
closed syst., in equilib., P-V work only
()*
closed syst., in equilib.
Material Equilibrium
Physical Chemistry
Physical Chemistry
Review from the last class
Material Equilibrium
Relations among different functions
The Gibbs Equations
Material Equilibrium
Physical Chemistry
()*
dG = -SdT + VdP
()
dA = -SdT - PdV
()
dH = TdS + VdP
dU = TdS - PdV
()*
closed syst., rev. proc., P-V work only
Material Equilibrium
Physical Chemistry
dG = -SdT + VdP
dA = -SdT - PdV
dH = TdS + VdP
dU = TdS - PdV
Maxwell Relations
()
()
Material Equilibrium
Physical Chemistry
()*
Isobaric thermal expansivity
Material Equilibrium
Physical Chemistry
pressibility
()*
()*
()
()
()*
Application of Maxwell Relations
Material Equilibrium
Physical Chemistry
Example 1: Prove that the internal energy of ideal gas is a function of temperature only.
Answers.
For ideal gas
Material Equilibrium
Physical Chemistry
Application of Maxwell Relations
Example 2: Calculate U when an ideal gas changes from P1, V1, T1 to P2, V2, T2. (Hint: applying )
Answers.