Degree of dissociation can be defined as a ratio of equivalence conductance at concentration c to the equivalence conductance at infinite dilution. That is it can be defined as follows:
a = Ac/Ainfinity
a,is the degree of dissociation
Ac , is the equivalence conductance at concentration c
Ainfinity, is the equivalence conductance at infinite dilution
Given:
Ac = 80
Ainfinity = 400
Thus, we have:
a = 80/400
a = 0.2