A PVC sample has an average molar mass of 125 000 g mol⁻¹. How many monomer units does an average chain contain (C = 12, H = 1, Cl = 35.5)?
Correct answer D. 2000
Explanation
The chloroethene unit C₂H₃Cl has a molar mass of 24 + 3 + 35.5 = 62.5 g mol⁻¹. Number of units = 125 000 ÷ 62.5 = 2000.
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