Page 20 - Chemical equilibria Volume 4

xviii Chemical Equilibria
m i:
number of components of a solution or a mixture of gases or
N: mass of component i.
involved in a reaction or number of molecules of a
collection.
N a: Avogadro’s number.
N A: number of molecules of component A.
N C: number of elements in the canonical ensemble.
n i: number of objects i in the system with energy ε i or number
of moles of component i.
n: translational quantum number or total number of moles in a
solution or a mixture.
(α)
n : total number of moles in a phase α.
P: pressure of a gas.
( subl ) : sublimating vapor pressure of component i.
P i
( vap ) 0
P i P : saturating vapor pressure of component i.
i
P c: critical pressure.
P i: partial pressure of component i.
p: number of external physical variables.
Q: heat involved.
Q P: heat of transformation at constant pressure.
(P)
Q : reaction quotient in terms of partial pressures.
(I)
Q : reaction quotient of a transformation in reference state (I).
Q V: transformation heat at constant volume.
ℜ: reaction rate.
R: perfect gas constant.

r : radius of the ionic atmosphere.
A
r 0: minimum energy gap between two molecules.
mix
S m : molar mixing entropy.
xs
S m : partial excess molar entropy of component i.
mix
S & m : partial mixing molar entropy of component i.
S: oversaturation of a solution.
S i, i S : entropy or partial molar entropy of i.