Igcse Model Questions Vol1 2021 Chemistry Question 30

Practice objective / multiple choice question 30 from the 2021 Igcse Model Questions Vol1 Chemistry examination.

Igcse Model Questions Vol1 2021 Chemistry Objective / Multiple Choice Hard Difficulty
Question 30 IGCSE_MODEL_QUESTIONS_VOL1 • 2021 • CHEMISTRY • objective

A random copolymer is prepared from monomer A (ethylene, \(C_2H_4\)) and monomer B (propylene, \(C_3H_6\)). The copolymer contains 60 % mole fraction of monomer A and 40 % of monomer B, and the degree of polymerisation is 5 000 monomer units. Calculate (a) the average molar mass of the polymer and (b) the mass percentage of carbon in the polymer.

Answer Options

A. (a) ≈ 1.80 × 10⁵ g mol⁻¹; (b) ≈ 86.5 % carbon by mass
B. (a) ≈ 1.70 × 10⁵ g mol⁻¹; (b) ≈ 85.0 % carbon by mass
C. (a) ≈ 1.55 × 10⁵ g mol⁻¹; (b) ≈ 84.2 % carbon by mass
Correct Answer D. (a) ≈ 1.68 × 10⁵ g mol⁻¹; (b) ≈ 85.7 % carbon by mass
Correct Answer
D
Correct Option:
(a) ≈ 1.68 × 10⁵ g mol⁻¹; (b) ≈ 85.7 % carbon by mass

About This Question

This is Igcse Model Questions Vol1 2021 Chemistry Question 30. It is one of the objective questions from the 2021 Igcse Model Questions Vol1 Chemistry examination.

Difficulty level: Hard .

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