Waec Model Questions Vol1 2024 Chemistry Question 34

Practice objective / multiple choice question 34 from the 2024 Waec Model Questions Vol1 Chemistry examination.

Waec Model Questions Vol1 2024 Chemistry Objective / Multiple Choice Hard Difficulty
Question 34 WAEC_MODEL_QUESTIONS_VOL1 • 2024 • CHEMISTRY • objective

A linear polyamide is prepared by condensation of succinic acid (C₄H₆O₄) with ethylenediamine (C₂H₈N₂). The polymer sample weighs 5.00 g and titration shows it contains 0.025 mol of terminal -NH₂ groups. Assuming each polymer chain has two terminal -NH₂ groups and that the polymer is perfectly linear with no branching, (a) calculate the number‑average degree of polymerisation (DPₙ), and (b) determine the percentage by mass of water eliminated during polymerisation.

Answer Options

Correct Answer A. DPₙ = 2.5; water eliminated ≈ 10.1 % by mass
B. DPₙ = 4.0; water eliminated ≈ 12.5 % by mass
C. DPₙ = 3.2; water eliminated ≈ 15.0 % by mass
D. DPₙ = 1.8; water eliminated ≈ 8.3 % by mass
Correct Answer
A
Correct Option:
DPₙ = 2.5; water eliminated ≈ 10.1 % by mass

About This Question

This is Waec Model Questions Vol1 2024 Chemistry Question 34. It is one of the objective questions from the 2024 Waec Model Questions Vol1 Chemistry examination.

Difficulty level: Hard .

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