In a step-growth polymerization reaction of Ethylene glycol and Adipic acid, what is the required number average degree of polymerization, , if you intend to produce a number average molecular weight, of 9,000 in a self-catalyzed reaction, open system? If you use an external catalyst (open system), what is your expected , if your equilibrium constant, K is at 45000? What if you do it in an open system, how much is your expected conversion (extent of reaction)?

Thank you, I need want to know how to answer this problem:)