Waec Model Questions Vol1 2019 Chemistry Question 34
Practice objective / multiple choice question 34 from the 2019 Waec Model Questions Vol1 Chemistry examination.
In a batch polymerisation of PET, 0.500 mol of terephthalic acid and 0.500 mol of ethylene glycol are reacted. After 2 h the intrinsic viscosity of the polymer solution is measured as [η] = 0.65 dL g⁻¹. For PET, [η] = K·DP^a with K = 0.0005 dL g⁻¹ and a = 0.8. The repeat‑unit molar mass is 192 g mol⁻¹. Determine (i) the degree of polymerisation DP, (ii) the number‑average molecular weight Mn, and (iii) the percentage conversion of monomer (use DP = 1/(1‑p)).
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This is Waec Model Questions Vol1 2019 Chemistry Question 34. It is one of the objective questions from the 2019 Waec Model Questions Vol1 Chemistry examination.
Difficulty level: Hard .
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