Gce Model Questions Vol1 2021 Chemistry Question 48
Practice objective / multiple choice question 48 from the 2021 Gce Model Questions Vol1 Chemistry examination.
A random copolymer is prepared from vinyl chloride (\(\mathrm{C_2H_3Cl}\), M = 62.5 g mol⁻¹, 35.5 g mol⁻¹ of chlorine) and ethylene (\(\mathrm{C_2H_4}\), M = 28.0 g mol⁻¹, no chlorine). Elemental analysis of the polymer shows that it contains 30.0 % chlorine by mass.\n(a) Determine the mole fraction of vinyl‑chloride units in the polymer chain.\n(b) If the number‑average molecular weight of the copolymer is \(1.20\times10^5\) g mol⁻¹, calculate the number‑average degree of polymerisation (total number of monomer units per chain) to the nearest whole number.
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This is Gce Model Questions Vol1 2021 Chemistry Question 48. It is one of the objective questions from the 2021 Gce Model Questions Vol1 Chemistry examination.
Difficulty level: Hard .
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