Take ethene, C₂H₄ = 28 g/mol. A sample of polyethene has an average molar mass of 42 000 g/mol. What is its average degree of polymerisation?
Correct answer A. 1500
Explanation
Degree of polymerisation = molar mass of polymer ÷ molar mass of repeat unit = 42 000/28 = 1500. Dividing by 14 (the CH₂ unit) gives the wrong value of 3000.
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