AbstractThe monomer content in polymers from bis(hydroxyethyl) terephthalate was previously found by Challa to be up to 63% higher than predicted by the classic equations of Flory. A reexamination shows that the apparent anomaly is caused by the approximative nature of the Flory equations which neglect the molar mass of the leaving molecules. Comparison of the experimental data with the predictions of the rigorous theory lowers the difference between experiment and theory significantly. The remaining differences scatter too much to allow any conclusions about a molar mass dependence of equilibrium or rate constants.