The temperature dependence of K can be used to determine the isoseric enthalpy of adsorption (
, the enthalpy of adsorption at a fixed surface coverage).
From Langmuir adsorption isotherm, fraction of covered surface,
(36.3.1)
or
So from free.equation ,
(36.3.2)
using , this rearranges to,
(36.3.3)
Thus, a plot of lnP against 1/T should be a straight line with slope . Therefore could be determined from the slope.
, the enthalpy of adsorption at a fixed surface coverage).
So from free.equation 
,
, this rearranges to, 
. Therefore 
could be determined from the slope. 
