A sample of nylon-6,6 has an average molar mass of 45 200 g/mol. The repeat unit, C₁₂H₂₂N₂O₂, has a molar mass of 226 g/mol. How many repeat units are in an average chain?
Correct answer C. 200
Explanation
Number of repeat units = molar mass of polymer ÷ molar mass of repeat unit = 45 200/226 = 200. Each repeat unit contains one diamine and one diacid residue, so it holds 400 monomer residues.
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