Q75 · CSIR-NET Chemistry, December 2017

Paper: CSIR-NET December 2017 · Subject: Physical Chemistry · Chapter: Polymer Chemistry · Topic: Molecular Weight Averages · Marks: 2 · Difficulty: Hard

A polymer has the following molar mass distribution
Number of moleculesMolar mass (g.mol-1)
505000
756000
The calculated number average molar mass ( $\overline{\mathrm{M}}_{\mathrm{n}}$ )of the polymer is
(a)5200
(b)5600
(c)5800
(d)6000
Answer
Answer: B ✓ checked by 4AB · confidence high
Explanation
M_n = (50×5000 + 75×6000)/125 = 700,000/125 = 5600 g mol⁻¹.

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