Abstract
Nonrandom behavior in the exchange of parts between variously sized, unbranched‐chain molecules is shown to be calculable from the concentrations of the two smallest chains and the over‐all stoichiometry of the equilibrated system. Furthermore, in equilibrated systems the over‐all compositions at which various molecules and submolecular structures maximize are treated in terms of the equilibrium constants describing the system, and it is shown that observed values of the maximal abundance of certain of these molecules and submolecular structures can be used to estimate the equilibrium constants describing the system.