Neco 2023 Chemistry Question 6
Practice objective / multiple choice question 6 from the 2023 Neco Chemistry examination.
An industrial step‑growth polymerisation of hexamethylenediamine (C6H16N2, M = 116 g·mol^{-1}) and adipic acid (C6H10O4, M = 146 g·mol^{-1}) yields nylon‑6,6. A 100 g sample of the product mixture contains 85 % (w/w) polymer and 15 % (w/w) unreacted monomers, the latter being present in equal masses of the two monomers. The number‑average molecular weight of the polymer fraction is 28 000 g·mol^{-1}.\n\n(i) Determine the degree of polymerisation (average number of repeat units) of the polymer.\n\n(ii) Using a mass‑balance, calculate the percentage of adipic‑acid monomer that remains unreacted in the sample.
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About This Question
This is Neco 2023 Chemistry Question 6. It is one of the objective questions from the 2023 Neco Chemistry examination.
Difficulty level: Hard .
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