Q138 · CSIR-NET Chemistry, December 2019

Paper: CSIR-NET December 2019 · Subject: Physical Chemistry · Chapter: Polymer Chemistry · Topic: Polymerisation Kinetics · Marks: 2 · Difficulty: Medium

The degree of polymerization at $t=10 \mathrm{h}$ of a polymer formed by a stepwise process with polymerization rate constant of $3 \times 10^{-2} \mathrm{M}^{-1} \mathrm{s}^{-1}$ and an initial monomer concentration of 50 mM is
(a)55
(b)65
(c)550
(d)505
Answer
Answer: A ✓ checked by 4AB · confidence high
Explanation
Carothers: ⟨N⟩ = 1 + kt[A]₀ = 1 + 3×10⁻² × 36,000 × 0.05 = 1 + 54 = 55.

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