Igcse Model Questions Vol1 2023 Chemistry Question 12
Practice objective / multiple choice question 12 from the 2023 Igcse Model Questions Vol1 Chemistry examination.
The intrinsic viscosity of a solution of poly(ethylene) is measured as \([\eta]=0.85\) dL·g⁻¹. For this polymer the Mark-Houwink relationship is \([\eta]=K\,M^{a}\) with \(K=1.2\times10^{-4}\) dL·g⁻¹·(g·mol⁻¹)⁻ᵃ and \(a=0.75\). Using these data, calculate the number‑average degree of polymerisation \(DP_{n}\) of the sample. (Molar mass of the ethene monomer = 28 g·mol⁻¹.) Give your answer to two significant figures.
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This is Igcse Model Questions Vol1 2023 Chemistry Question 12. It is one of the objective questions from the 2023 Igcse Model Questions Vol1 Chemistry examination.
Difficulty level: Hard .
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