Question:
In a polymer sample, 30% of molecules have a molecular mass of 20,000, 40% have 30,000 and the rest 60,000. What is the weight average molecular mass of the polymer ?
In a polymer sample, 30% of molecules have a molecular mass of 20,000, 40% have 30,000 and the rest 60,000. What is the weight average molecular mass of the polymer ?
Updated On: Jul 6, 2022
- 40300
- 30600
- 43333
- 50400
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The Correct Option is C
Solution and Explanation
$\bar{M}_w = \frac{30(20000)^2 + 40 (30000)^2 + 30(60000)^2}{30 \times 2000) + (40 + 30000)+(30 \times 60000)} = 43.333$
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