sentences:  The other advantage to this experimental method is that in certain cases, it is feasible to determine the approximate molecular weight of a compound.The shape and size of the compound (eluent) determine how the compound interacts with the gel (stationary phase).To determine approximate molecular weight, the elution volumes of compounds with their corresponding molecular weights are obtained and then a plot of “Kav” vs “log(Mw)” is made, where formula_1and Mw is the molecular mass.