For a linear polymer molecule, the total chain length L depends on the bond length between chain atoms d, the total number of bonds in the molecule N, and the angle between adjacent backbone chain atoms e, as follows: L = Nd sin (4.9) Furthemore, the average end-to-end distance for a series of polymer molecules ris equal to: r = = dVN (4.10) For a linear polytetrafluoroethylene determine: (a) the number-average molecular weight for L= 2000 nm; Mn = 797780 g/mol (b) the number-average molecular weight for r = 17 nm. Mn = 610512 g/mol Click here to access Table 4.3. Atomic weights for several elements are included in the following table: Carbon 12.01 g/mol Chlorine 35.45 g/mol Fluorine 19.00 g/mol Hydrogen 1.008 g/mol Oxygen 16.00 g/mol