If one of the monomers in a copolymerization has a functionality greater than 2, a branched copolymer can be formed. It is also possible for the branches to react and create cross-links. In this way, “infinite” polymer networks called gels are made. Definitions: PA = probability that A reacts PB = probability that B reacts NAo = original number of A groups (@ t = 0) NBo = original number of B groups (@ t = 0) r=NAo/NBo Assuming A can only react with B: NAoPA = NBoPB and rPA = PB qc =1/(f-1)and q=(PAPBp)/(1-PAPB(1-p)) p = (3*0.5 moles)/(2*1 mole+3*0.5 moles) = 1.5/3.5 = 0.43