The degree of polymerization of polytetrafluoroethylene (see Table 16-3) is 7500. If all of the polymer chains are the same length, calculate 

(a) The molecular weight of the chains, and 

(b) The total number of chains in 1000 g of the polymer.

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Polymer Polyethylene (PE) Polyvinyl chloride (PVC) Polypropylene (PP) Polystyrene (PS) Repeat Unit H H C-C H H H H H H H-C-H H H Application Packaging films, wire insulation, squeeze bottles, tubing, household items Pipe, valves, fittings, floor tile, wire insulation, vinyl automobile roofs Tanks, carpet fibers, rope, packaging Packaging and insulation foams, lighting panels, appliance components, egg cartons Polymer Polyacrylonitrile (PAN) Polymethyl methacrylate (PMMA) (acrylic-Plexiglas) Polychlorotri- fluoroethylene Polytetrafluoroethylene (Teflon) (PTFE) Repeat Unit Η HE Н C=N 41 H H H F C=0 C-C -H H F F -H Application Textile fibers, precursor for carbon fibers, food containers Windows, windshields, coatings, hard contact lenses, lighted signs Valve components, gaskets, tubing, electrical insulation Seals, valves, non-stick coatings