Neco Model Questions Vol1 2024 Chemistry Question 41
Practice objective / multiple choice question 41 from the 2024 Neco Model Questions Vol1 Chemistry examination.
A random step‑growth copolymer is prepared from monomer A (M_w = 100 g·mol^{-1}) and monomer B (M_w = 200 g·mol^{-1}). The initial molar feed ratio is 3 mol of A to 2 mol of B. During polymerisation the conversion of A is 80 % and that of B is 60 %. Assuming ideal random copolymerisation, calculate (i) the number‑average molecular weight \(M_n\), (ii) the weight‑average molecular weight \(M_w\), and (iii) the polydispersity index \(PDI = M_w/M_n\).
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This is Neco Model Questions Vol1 2024 Chemistry Question 41. It is one of the objective questions from the 2024 Neco Model Questions Vol1 Chemistry examination.
Difficulty level: Hard .
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