3. 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 , as follows: L=Ndsin(2) Furthermore, the average end-to-end distance for a series of polymer molecules r in Figure 4.6 is equal to r=dN A linear polyethylene has a number-average molecular weight of 313,000 g/mol; compute average values of L and r for this material