Waec Model Questions Vol1 2019 Chemistry Question 47
Practice objective / multiple choice question 47 from the 2019 Waec Model Questions Vol1 Chemistry examination.
A polyester is prepared by the step‑growth polymerisation of equimolar terephthalic acid (M = 146 g·mol⁻¹) and ethylene glycol (M = 62 g·mol⁻¹). Each ester linkage eliminates one molecule of water (M = 18 g·mol⁻¹). A 10.0 g sample of the polymer has a number‑average molecular weight of 2.0×10⁴ g·mol⁻¹. (i) Calculate the average number of repeating units in the polymer chain. (ii) Determine the extent of reaction (percentage of monomer units that have reacted).
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This is Waec Model Questions Vol1 2019 Chemistry Question 47. It is one of the objective questions from the 2019 Waec Model Questions Vol1 Chemistry examination.
Difficulty level: Hard .
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