he formula of ethylene is CH2CH2, and the step length of each monomer in the molecular chain is 0.254 nm. (1). Calculate the average molecular weight of a linear polyethylene (I), the average end-to- end length and the contour length of its molecule if its degree of polymerization (n) is 1000. (2). Given another linear polyethylene (II) with a degree of polymerization (n) of 5000, calculate its average molecular weight, average end-to-end length and the contour length of its molecule. (3) Compare the melting point, glass transition and tensile strength of these two polyethylene materials and give your reason(s).