By equating the appropriate scattering expressions, the structure factors (SF)SCC(0),SNC(0) andSNN(0) of a binaryA-Balloy with tendency to form associatesAμBν, (μ, ν small integers), are expressed in terms of the six SFSαβ1(0) of the ternary mixture ofA, BandAμBνand their concentrationsxα(α = 1, 2, 3). Whenxαsatisfy the equilibrium condition for the reaction μA+ νBAμBν, these relations become thermodynamic identities; otherwise they determineSCC(0) etc. for the nonequilibrium situations. The difference betweenSCC(0) etc., when there is equilibrium and when the chemical degree of freedom is frozen in, say, by quenching, is discussed. The relations between the aboveSCC(0) etc. and the corresponding SF for a strongly associating mixture in the “chemical” scheme (system regarded as a binary mixture ofAμBνandAorBatoms) are also obtained.