Waec Model Questions Vol1 2024 Chemistry Question 6
Practice objective / multiple choice question 6 from the 2024 Waec Model Questions Vol1 Chemistry examination.
A free‑radical copolymer is prepared from monomer A (C4H6, M = 54 g·mol⁻¹) and monomer B (C3H4, M = 40 g·mol⁻¹). The initial molar ratio of A:B is 3:2. In Sample 1, 80 % of A and 70 % of B are converted; in Sample 2, 70 % of A and 80 % of B are converted. Both samples give a number‑average degree of polymerisation (DPₙ) of 5 000. (i) Calculate the number‑average molecular weight (Mₙ) of the copolymer in Sample 1 (expressed to three significant figures in g·mol⁻¹). (ii) Which sample will have the higher tensile strength, assuming tensile strength is directly proportional to Mₙ? State the answer as "Sample 1" or "Sample 2".
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This is Waec Model Questions Vol1 2024 Chemistry Question 6. It is one of the objective questions from the 2024 Waec Model Questions Vol1 Chemistry examination.
Difficulty level: Hard .
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