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A sample of polystyrene has the following fractions composed of molecules of different sizes. Find a) weight average molecular weight (Mw) b) number average molecular

A sample of polystyrene has the following fractions composed of molecules of different sizes. Find a) weight average molecular weight (Mw) b) number average molecular weight (Mn) and c) heterogeneity index (H.I) values of this polymer sample.

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