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  3. hw 2 megr 3090 due date 1222019 1 chromatographic...

Question: hw 2 megr 3090 due date 1222019 1 chromatographic...

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HW # 2 MEGR 3090 Due date 1/22/2019 1. Chromatographic analysis measured the molecular weight in a polymer sample and showed the following molecular weight categories with the number of molecules in each category. The results are in the table below (a) Calculate the numerical fraction of each category of molecules. (b) Calculate the Number average molecular weight (Mn) for the polymer (c) Calculate the weight fraction of each category of molecules (d) Calculate the Weight average molecular weight (Mw)of the polymer (e) Why the value of Mn is significantly affected by the number of small molecules Number of Mass of each Molecules Mole 800,000 750,000 700,000 650,000 600,000 550,000 500,000 450,000 400,000 350,000 300,000 250,000 200,000 10 13 20 13 10 2. Mention Four structure parameters that do not exist in metals and could affect the properties of polymeric material
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