Igcse Model Questions Vol1 2025 Chemistry Question 25

Practice objective / multiple choice question 25 from the 2025 Igcse Model Questions Vol1 Chemistry examination.

Igcse Model Questions Vol1 2025 Chemistry Objective / Multiple Choice Hard Difficulty
Question 25 IGCSE_MODEL_QUESTIONS_VOL1 • 2025 • CHEMISTRY • objective

A copolymer is prepared from monomer A (\(\mathrm{C_4H_6O_2}\), \(M_A = 86\) g mol⁻¹) and monomer B (\(\mathrm{C_3H_4O}\), \(M_B = 56\) g mol⁻¹). Analysis shows that the polymer contains 70 % by mass of monomer A and 30 % by mass of monomer B. The number‑average degree of polymerisation is 150. Calculate (a) the number‑average molecular weight of the copolymer, and (b) the weight fraction of repeat units derived from monomer B in the polymer chain.

Answer Options

A. M_n ≈ 9.8×10^3 g/mol; weight fraction of B = 0.40
Correct Answer B. M_n ≈ 1.11×10^4 g/mol; weight fraction of B = 0.30
C. M_n ≈ 1.05×10^4 g/mol; weight fraction of B = 0.25
D. M_n ≈ 1.20×10^4 g/mol; weight fraction of B = 0.35
Correct Answer
B
Correct Option:
M_n ≈ 1.11×10^4 g/mol; weight fraction of B = 0.30

About This Question

This is Igcse Model Questions Vol1 2025 Chemistry Question 25. It is one of the objective questions from the 2025 Igcse Model Questions Vol1 Chemistry examination.

Difficulty level: Hard .

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