Neco 2022 Chemistry Question 27
Practice objective / multiple choice question 27 from the 2022 Neco Chemistry examination.
A polymer solution at 25\,\text{°C} has an intrinsic viscosity \([\eta]=0.85\ \text{dL g}^{-1}\). The polymer obeys the Mark-Houwink relation \([\eta]=K\,M^{a}\) with \(K=1.2\times10^{-4}\ \text{dL g}^{-1}\,(\text{g mol}^{-1})^{-a}\) and \(a=0.75\). (i) Determine the weight‑average molecular weight \(M_{w}\). (ii) If the monomer molar mass is 84\,\text{g mol}^{-1}, calculate the degree of polymerisation (number of monomer units per chain).
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About This Question
This is Neco 2022 Chemistry Question 27. It is one of the objective questions from the 2022 Neco Chemistry examination.
Difficulty level: Hard .
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