Waec Model Questions Vol1 2020 Chemistry Question 28
Practice objective / multiple choice question 28 from the 2020 Waec Model Questions Vol1 Chemistry examination.
In a step‑growth polymerisation of adipic acid (C₆H₁₀O₄, M = 146.14 g mol⁻¹) with hexanediol (C₆H₁₄O₂, M = 118.18 g mol⁻¹), the initial mixture contains 0.050 mol of each monomer. However, 0.005 mol of the monofunctional impurity hexanol (C₆H₁₄O, M = 102.18 g mol⁻¹) is present and reacts with the acid groups, reducing the number of acid functional groups available. The reaction proceeds to 90 % conversion of the remaining functional groups. Calculate the number‑average degree of polymerisation (DPₙ) of the polyester formed. Give DPₙ to one decimal place.
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About This Question
This is Waec Model Questions Vol1 2020 Chemistry Question 28. It is one of the objective questions from the 2020 Waec Model Questions Vol1 Chemistry examination.
Difficulty level: Hard .
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