Neco Model Questions Vol1 2020 Chemistry Question 26
Practice objective / multiple choice question 26 from the 2020 Neco Model Questions Vol1 Chemistry examination.
An industrial step‑growth polymerisation of terephthalic acid and ethylene glycol yields a sample of polyethylene terephthalate (PET) whose number‑average molecular weight is \(2.0 \times 10^{4}\ \text{g mol}^{-1}\). The repeat unit of PET has a molar mass of \(192\ \text{g mol}^{-1}\). The polymerisation was carried out in a 2.0 L reactor initially containing 1.5 mol L\(^{-1}\) of each monomer. Assuming ideal step‑growth behaviour and using Carothers equation, calculate: (a) the extent of reaction (fractional conversion) \(p\) that must have been achieved, (b) the percentage of each monomer that remains unreacted at the end of the reaction.
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This is Neco Model Questions Vol1 2020 Chemistry Question 26. It is one of the objective questions from the 2020 Neco Model Questions Vol1 Chemistry examination.
Difficulty level: Hard .
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