(DG'_Cl) is associated with interaction between a chlorine atom and the stationary phase,

      and (DG'_Br) is associated with interaction between a bromine atom and the stationary phase.

Equations (9) to (18) can be used (with the aid of a simple, iterative computer program) to solve for (DG'_H), (DG'_C), (DG'_Cl) and (DG'_Br).  However, it is clear that equations (9) to (11) can be replaced by a general equation for the chlorine substituted methanes, likewise equations (12) to (14) can be replaced by a general equation for the bromine substituted methanes and equations (15) to (17) can be replaced by a general equation for the chlorine substituted bromomethanes. Similarly, equations (15) and (18) are  members of the bromine substituted monochloromethanes.

Thus, the general equation for the chlorine substituted methanes will be,

                 (19)

the general equation for the bromine substituted methanes will be,