Igcse Model Questions Vol1 2017 Chemistry Question 37
Practice objective / multiple choice question 37 from the 2017 Igcse Model Questions Vol1 Chemistry examination.
In a free‑radical polymerisation of vinyl chloride, the steady‑state concentration of growing radicals is \(1.0\times10^{-6}\) mol dm⁻³. The monomer concentration is 2.0 mol dm⁻³, the propagation rate constant \(k_{p}=1.5\times10^{4}\) dm³ mol⁻¹ s⁻¹, and termination occurs only by combination with \(k_{t}=5.0\times10^{6}\) dm³ mol⁻¹ s⁻¹. (a) Calculate the average degree of polymerisation (\(DP_{n}\)) after a long reaction time, assuming the radical concentration remains constant. (b) Determine the number‑average molecular weight (\(M_{n}\)) of the polymer (molar mass of the repeat unit = 62.5 g mol⁻¹).
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This is Igcse Model Questions Vol1 2017 Chemistry Question 37. It is one of the objective questions from the 2017 Igcse Model Questions Vol1 Chemistry examination.
Difficulty level: Hard .
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