37)
Kb
=
2
1
b
vap
 × 
1000 ×  × 
R
M
T
H
(1 38)
Here the symbols R and M1 stand for the gas constant and molar
mass of the solvent, respectively and Tf and Tb denote the freezing point
and the boiling point of the pure solvent respectively in kelvin Further,
DfusH and DvapH represent the enthalpies for the fusion and vapourisation
of the solvent, respectively Solvent
b