Fugacity: It is derived from Latin, expressed as fleetness or escaping ...

Estimation of Partial molar properties for a binary mixture :
Two methods for estimation
Analytical Method and Graphical Method(Tangent Intercept method)
Analytical Method: The general relation between partial molar property and molar
property of the solution is given by
M
M i M xk
x
K T , P,
nk
For binary mixture
i 1, k 2
k i x1
M
M 1 M x2
x
2 T , P
2 x1
1
At constant Temperature and pressure
M
M
1 M ( 1
x1)
------(a)
x1
M
M
2 M x
1
-----------(b)
x1
x , x2 1 x1
, x2
x1
The partial molar property (e xtensive property) for a binary mixture can be estimated
from the property of solution using above equations (a) and (b).
Tangent Intercept method:
This is the graphical method to estimate partial molar properties. If the partial molar
property (M) is plotted against the composition we get the curve as shown in the figure.