Gce Model Questions Vol1 2017 Chemistry Question 43
Practice objective / multiple choice question 43 from the 2017 Gce Model Questions Vol1 Chemistry examination.
A step‑growth polymerisation is carried out between a diacid of molar mass \(146\ \mathrm{g\ mol^{-1}}\) and a diamine of molar mass \(60\ \mathrm{g\ mol^{-1}}\) in equimolar amounts. After polymerisation the number‑average degree of polymerisation is measured to be 50. Assuming a Poisson distribution, calculate the weight‑average molecular weight \(M_w\) and then the intrinsic viscosity \([\eta]\) using the Mark-Houwink relation \([\eta]=K\,M_w^{a}\) with \(K=1.5\times10^{-4}\ \mathrm{dL\ g^{-1}}\) and \(a=0.75\). Give \([\eta]\) to two significant figures.
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This is Gce Model Questions Vol1 2017 Chemistry Question 43. It is one of the objective questions from the 2017 Gce Model Questions Vol1 Chemistry examination.
Difficulty level: Hard .
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