Waec Model Questions Vol1 2023 Chemistry Question 20
Practice objective / multiple choice question 20 from the 2023 Waec Model Questions Vol1 Chemistry examination.
A polyester is formed by condensation of monomer A (C₂H₄O₂, M = 60 g mol⁻¹) and monomer B (C₃H₆O, M = 58 g mol⁻¹) in a 1:1 molar ratio, losing one molecule of water (M = 18 g mol⁻¹) per repeating unit. A sample of the polymer has a number‑average molecular weight of 1.20 × 10⁵ g mol⁻¹. (i) Determine the average degree of polymerisation (DP). (ii) If each repeating unit releases 0.5 kJ upon combustion, calculate the heat of combustion per gram of polymer. Give DP as a whole number and the heat of combustion in J g⁻¹ to the nearest whole number.
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This is Waec Model Questions Vol1 2023 Chemistry Question 20. It is one of the objective questions from the 2023 Waec Model Questions Vol1 Chemistry examination.
Difficulty level: Hard .
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