Waec Model Questions Vol1 2020 Chemistry Question 48

Practice objective / multiple choice question 48 from the 2020 Waec Model Questions Vol1 Chemistry examination.

Waec Model Questions Vol1 2020 Chemistry Objective / Multiple Choice Hard Difficulty
Question 48 WAEC_MODEL_QUESTIONS_VOL1 • 2020 • CHEMISTRY • objective

A step‑growth polymer is formed from equimolar amounts of monomer A (C₂H₄O, M = 44 g mol⁻¹) and monomer B (C₃H₆N₂, M = 70 g mol⁻¹). The extent of reaction is p = 0.98. (a) Calculate the number‑average degree of polymerisation (DPₙ). (b) Determine the number‑average molecular weight (Mₙ) of the polymer. (c) Using the Mark‑Houwink relation [η] = K·Mⁿ with K = 1.2×10⁻³ dL g⁻¹ and n = 0.75, find the intrinsic viscosity of the polymer solution.

Answer Options

A. DPₙ = 55; Mₙ = 6.30×10³ g mol⁻¹; [η] ≈ 8.5×10⁻¹ dL g⁻¹
B. DPₙ = 60; Mₙ = 5.70×10³ g mol⁻¹; [η] ≈ 7.9×10⁻² dL g⁻¹
Correct Answer C. DPₙ = 50; Mₙ = 5.70×10³ g mol⁻¹; [η] ≈ 7.9×10⁻¹ dL g⁻¹
D. DPₙ = 45; Mₙ = 5.10×10³ g mol⁻¹; [η] ≈ 6.8×10⁻¹ dL g⁻¹
Correct Answer
C
Correct Option:
DPₙ = 50; Mₙ = 5.70×10³ g mol⁻¹; [η] ≈ 7.9×10⁻¹ dL g⁻¹

About This Question

This is Waec Model Questions Vol1 2020 Chemistry Question 48. It is one of the objective questions from the 2020 Waec Model Questions Vol1 Chemistry examination.

Difficulty level: Hard .

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