Ideal Gases and the Compressibility Factor

1
(No Transcript)
2
(No Transcript)
3
(No Transcript)
4
Ideal Gases and the Compressibility Factor
1 mol, 300K for various gases
5
Effect of Pressure on Compressibility Factor
CH4, various temperatures
6
Comparing Various Equations of State
Ethane, 400K
van der Waals
Redlich-Kwong
Peng-Robinson
Solid line experimental
7
Second Virial Coefficient and Intermolecular
Potentials
The second virial coefficient is the most
important. Can be determined by plotting Z vs. P.
8
The effect of temperature
At high T B2V increases
Boyle temperature Temperature at which B2V(T)
0. Repulsive and attractive interactions cancel
and gas behaves ideal
9
The Lennard-Jones Potential
Contributions Dipole-dipole (including
H-bonding) Induced dipole London dispersion
attraction
The long range 1/r6 attractive term
The short range 1/r12 repulsive term
u(r)/e
0
e
r/s
0
1
2
3