Neco 2021 Chemistry Question 17
Practice objective / multiple choice question 17 from the 2021 Neco Chemistry examination.
A step‑growth polymer is formed from the monomer A (molar mass 86 g mol\(^{-1}\)). The extent of reaction is \(p = 0.85\).\n(a) Calculate the number‑average degree of polymerisation \( \bar{X}_n \).\n(b) If the polymer is used to prepare a 0.250 M solution in 500 mL of water, determine the mass of polymer required.\n(c) During storage the polymer undergoes 10 % chain scission, reducing its average molecular weight proportionally. Re‑calculate the mass of polymer needed to obtain the same 0.250 M solution of the original polymer.
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About This Question
This is Neco 2021 Chemistry Question 17. It is one of the objective questions from the 2021 Neco Chemistry examination.
Difficulty level: Hard .
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