Q140 · CSIR-NET Chemistry, December 2019

Paper: CSIR-NET December 2019 · Subject: Physical Chemistry · Chapter: Polymer Chemistry · Topic: Molecular Weight Averages · Marks: 2 · Difficulty: Medium

A sample of polysterene is composed of three weight fractions: $0.20,0.50$ and 0.30 . The molecular weight of these fractions are $10,000,40,000$ and 60,000 , respectively. The weight average molecular weight of this sample is
(a)40000
(b)55000
(c)50000
(d)60000
Answer
Answer: A ✓ checked by 4AB · confidence high
Explanation
M_w = Σwᵢ Mᵢ = 0.2(10,000) + 0.5(40,000) + 0.3(60,000) = 40,000 (a).

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