Waec Model Questions Vol1 2018 Chemistry Question 20
Practice objective / multiple choice question 20 from the 2018 Waec Model Questions Vol1 Chemistry examination.
In a batch polymerisation, 1500 g of ethylene glycol (M = 62 g mol⁻¹) reacts with 2000 g of terephthalic acid (M = 166 g mol⁻¹) to form poly(ethylene terephthalate) (PET). The repeat unit of PET has a molar mass of 192 g mol⁻¹ (loss of one water molecule per ester link).\n(a) Determine the degree of polymerisation (DP).\n(b) Calculate the number‑average molecular weight (Mₙ).\n(c) Using the Mark-Houwink equation η = K·Mₙ^{a} with K = 1.2×10⁻⁴ Pa·s·(g mol⁻¹)^{‑a} and a = 0.7, compute the viscosity η of the polymer melt.
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This is Waec Model Questions Vol1 2018 Chemistry Question 20. It is one of the objective questions from the 2018 Waec Model Questions Vol1 Chemistry examination.
Difficulty level: Hard .
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