Neco 2019 Chemistry Question 34

Practice objective / multiple choice question 34 from the 2019 Neco Chemistry examination.

Neco 2019 Chemistry Objective / Multiple Choice Hard Difficulty
Question 34 NECO • 2019 • CHEMISTRY • objective

A polymer solution has an intrinsic viscosity \( [\eta] = 0.85\,\text{dL g}^{-1} \) in a solvent for which the Mark-Houwink constants are \( K = 1.5\times10^{-3}\,\text{dL g}^{-1} \) and \( a = 0.75 \). (a) Calculate the viscosity‑average molecular weight \( M_v \) of the polymer. (b) If the monomer unit has a molar mass of 100 g·mol^{-1}, determine the average degree of polymerisation (DP).

Answer Options

A. M_v ≈ 3.9×10^3 g·mol^{-1}; DP ≈ 39
Correct Answer B. M_v ≈ 4.7×10^3 g·mol^{-1}; DP ≈ 47
C. M_v ≈ 4.7×10^4 g·mol^{-1}; DP ≈ 470
D. M_v ≈ 5.2×10^3 g·mol^{-1}; DP ≈ 52
Correct Answer
B
Correct Option:
M_v ≈ 4.7×10^3 g·mol^{-1}; DP ≈ 47

About This Question

This is Neco 2019 Chemistry Question 34. It is one of the objective questions from the 2019 Neco Chemistry examination.

Difficulty level: Hard .

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