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Unformatted text preview: Sample question for ChE 350 Spring 2010 Quiz 7 Name:________________________ 2 (b) What is the monomer molecular weight of polyethylene?: ___________________ (c) What is the average degree of polymerization for a sample of polyethylene with a number average molecular weight of 280,000? ______________________ 4. Molecular weight data for a polymer are tabulated below. (a) Fill in the blanks in the table, calculating mole fraction, weight fraction, x i M i and w i M i . (b) Compute the number average molecular weight: _____________________ (c) Compute the weight average molecular weight: _______________________ (d) Compute the polydispersity index: _____________________________ (e) Would this polymer be considered monodisperse?________________________ Number of Molecules Mass of each Molecule (M i , g/mol) Mole Fraction (x i ) Weight Fraction (w i ) x i M i w i M i 50 4000 40 10000 30 20000 20 50000 10 100000...
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