Igcse Model Questions Vol1 2020 Chemistry Question 34

Practice objective / multiple choice question 34 from the 2020 Igcse Model Questions Vol1 Chemistry examination.

Igcse Model Questions Vol1 2020 Chemistry Objective / Multiple Choice Hard Difficulty
Question 34 IGCSE_MODEL_QUESTIONS_VOL1 • 2020 • CHEMISTRY • objective

In a step‑growth polymerisation, equimolar amounts of monomer A (Mₐ = 100 g mol⁻¹) and monomer B (M_b = 150 g mol⁻¹) react. The extent of reaction is \(p = 0.90\). (a) Calculate the number‑average degree of polymerisation \(DP_{n}\) and the weight‑average degree of polymerisation \(DP_{w}\). (b) Determine the polydispersity index \(PDI\). (c) Using the average monomer molar mass, calculate the number‑average molecular weight \(M_{n}\) and the weight‑average molecular weight \(M_{w}\).

Answer Options

A. DPₙ = 11; DP_w = 20; PDI = 1.8; Mₙ = 1375 g mol⁻¹; M_w = 2500 g mol⁻¹
B. DPₙ = 10; DP_w = 20; PDI = 2.0; Mₙ = 1250 g mol⁻¹; M_w = 2500 g mol⁻¹
Correct Answer C. DPₙ = 10; DP_w = 19; PDI = 1.9; Mₙ = 1250 g mol⁻¹; M_w = 2375 g mol⁻¹.
D. DPₙ = 9; DP_w = 18; PDI = 2.0; Mₙ = 1125 g mol⁻¹; M_w = 2250 g mol⁻¹
Correct Answer
C
Correct Option:
DPₙ = 10; DP_w = 19; PDI = 1.9; Mₙ = 1250 g mol⁻¹; M_w = 2375 g mol⁻¹.

About This Question

This is Igcse Model Questions Vol1 2020 Chemistry Question 34. It is one of the objective questions from the 2020 Igcse Model Questions Vol1 Chemistry examination.

Difficulty level: Hard .

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