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Problem 3. Calculate the number-average molecular weight, weight-average molecular weight, and the dispersity of a polymer sample that contains: 25% 20-mers, 15% 42-mers, 10% 50-mers,

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Problem 3. Calculate the number-average molecular weight, weight-average molecular weight, and the dispersity of a polymer sample that contains: 25% 20-mers, 15\% 42-mers, 10\% 50-mers, 20\% 55-mers, and 30\% 60-mers if the molecular weight of a repeat unit is 110gmol1. In the parlance of this course, does this polymer sample have a narrow or broad molecular weight distribution

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