Waec Model Questions Vol1 2025 Chemistry Question 41
Practice objective / multiple choice question 41 from the 2025 Waec Model Questions Vol1 Chemistry examination.
A polyester is formed by condensation of terephthalic acid (C₈H₆O₄, M = 166 g·mol⁻¹) and ethylene glycol (C₂H₆O₂, M = 62 g·mol⁻¹). Each ester linkage results from the loss of one molecule of water (M = 18 g·mol⁻¹). The repeating unit of the polymer therefore consists of one molecule of each monomer after loss of water. A sample of this polymer has a number‑average molecular weight (Mₙ) of 45 000 g·mol⁻¹. (a) Determine the mass of the repeating unit. (b) Calculate the degree of polymerisation (the number of repeating units) in the polymer chain.
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This is Waec Model Questions Vol1 2025 Chemistry Question 41. It is one of the objective questions from the 2025 Waec Model Questions Vol1 Chemistry examination.
Difficulty level: Hard .
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