Igcse Model Questions Vol1 2024 Chemistry Question 37

Practice objective / multiple choice question 37 from the 2024 Igcse Model Questions Vol1 Chemistry examination.

Igcse Model Questions Vol1 2024 Chemistry Objective / Multiple Choice Hard Difficulty
Question 37 IGCSE_MODEL_QUESTIONS_VOL1 • 2024 • CHEMISTRY • objective

A polymer is produced from ethylene (C₂H₄, molar mass 28 g mol⁻¹). A 5.6 g sample contains 2.0×10²⁰ polymer molecules. (a) Determine the average degree of polymerisation (DP) and the number‑average molecular weight (Mₙ). (b) If another sample of the same polymer has a DP that is twice as large, estimate the ratio of its melt viscosity to that of the first sample, assuming η ∝ (DP)^{1.4}.

Answer Options

A. DP ≈ 800; Mₙ ≈ 2.24×10⁴ g mol⁻¹; viscosity ratio ≈ 3.80
B. DP ≈ 450; Mₙ ≈ 1.26×10⁴ g mol⁻¹; viscosity ratio ≈ 2.00
C. DP ≈ 300; Mₙ ≈ 8.43×10³ g mol⁻¹; viscosity ratio ≈ 1.30
Correct Answer D. DP ≈ 602; Mₙ ≈ 1.69×10⁴ g mol⁻¹; viscosity ratio ≈ 2.64
Correct Answer
D
Correct Option:
DP ≈ 602; Mₙ ≈ 1.69×10⁴ g mol⁻¹; viscosity ratio ≈ 2.64

About This Question

This is Igcse Model Questions Vol1 2024 Chemistry Question 37. It is one of the objective questions from the 2024 Igcse Model Questions Vol1 Chemistry examination.

Difficulty level: Hard .

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