Neco 2022 Chemistry Question 11
Practice objective / multiple choice question 11 from the 2022 Neco Chemistry examination.
An unknown copolymer is prepared from monomer A (C4H6, \(M = 54\ \text{g·mol}^{-1}\)) and monomer B (C2H4, \(M = 28\ \text{g·mol}^{-1}\)). Elemental analysis shows that the polymer contains 62\% by mass of monomer A and 38\% by mass of monomer B. The number‑average molecular weight of the polymer sample is \(24\,000\ \text{g·mol}^{-1}\). Assuming the polymer consists of a single repeat unit that contains integer numbers of monomer A and monomer B units, determine (i) the smallest whole‑number ratio of monomer A to monomer B in the repeat unit, and (ii) the degree of polymerisation (DP) of the sample (rounded to the nearest integer).
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About This Question
This is Neco 2022 Chemistry Question 11. It is one of the objective questions from the 2022 Neco Chemistry examination.
Difficulty level: Hard .
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