Igcse Model Questions Vol1 2022 Chemistry Question 9
Practice objective / multiple choice question 9 from the 2022 Igcse Model Questions Vol1 Chemistry examination.
A polymer is formed by condensation of a monomer M (molar mass 180 g mol\(^{-1}\)). The intrinsic viscosity \([η]\) of a polymer solution obeys the Mark-Houwink equation \([η] = K\,DP^{a}\) with \(K = 1.2\times10^{-4}\,\text{dL g}^{-1}\) and \(a = 0.75\). An experiment measures \([η] = 0.018\) dL g\(^{-1}\). (a) Calculate the degree of polymerisation (DP). (b) Determine the number‑average molecular weight \(M_n\). (c) If the theoretical maximum \(M_n\) (complete conversion) would be \(1.80\times10^{5}\) g mol\(^{-1}\), calculate the percentage yield of the polymerisation.
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This is Igcse Model Questions Vol1 2022 Chemistry Question 9. It is one of the objective questions from the 2022 Igcse Model Questions Vol1 Chemistry examination.
Difficulty level: Hard .
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