Gce Model Questions Vol1 2020 Chemistry Question 45
Practice objective / multiple choice question 45 from the 2020 Gce Model Questions Vol1 Chemistry examination.
A polymer solution obeys the Mark-Houwink relationship \([\eta] = K M^{a}\) with \(K = 1.2\times10^{-4}\ \text{dL g}^{-1}\) and \(a = 0.75\). The measured intrinsic viscosity of a 0.5 dL g⁻¹ solution is 0.85 dL g⁻¹. (a) Determine the number‑average molecular weight \(M_n\) of the polymer. (b) Given that the monomer molar mass is 100 g mol⁻¹, calculate the average degree of polymerisation \(DP\). (Give \(M_n\) to two significant figures in scientific notation.)
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This is Gce Model Questions Vol1 2020 Chemistry Question 45. It is one of the objective questions from the 2020 Gce Model Questions Vol1 Chemistry examination.
Difficulty level: Hard .
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