Gce Model Questions Vol1 2018 Chemistry Question 45
Practice objective / multiple choice question 45 from the 2018 Gce Model Questions Vol1 Chemistry examination.
The intrinsic viscosity \([\eta]\) of a poly(vinyl chloride) (PVC) solution in tetrahydrofuran at 25 °C is measured as 0.85 dL·g⁻¹. For PVC the Mark-Houwink relationship is \([\eta] = K M^{a}\) with \(K = 1.2 \times 10^{-4}\ \text{dL g}^{-1}\) and \(a = 0.70\). (i) Calculate the number‑average molecular weight \(M_{n}\) of the polymer. (ii) Given that the molar mass of the repeating unit C₂H₃Cl is 62.5 g·mol⁻¹, calculate the average degree of polymerisation (DP).
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This is Gce Model Questions Vol1 2018 Chemistry Question 45. It is one of the objective questions from the 2018 Gce Model Questions Vol1 Chemistry examination.
Difficulty level: Hard .
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