Figure 1. Comparison of the weight (WBM) vs. molar based metrics (MBM).

(a) MBM: the Avogadro number of molecules (higher weight for higher MW molecules); (b) WBM: a unit weight can contain either a larger number of lower MW molecules or a lower number of the higher MW molecules. Thus, the ratio of the benzene to [18]annulene molecules in the same weight unit will amount to 1 to 3 in the WBM.