( (b) The molecular weight data of a Polymer Y are given in Table 1. Once undergone a melting process, it achieves degree of polymerization (DP) of 498 upon solidification, i. ii. Calculate the number-average molecular weight (Mn) for the polymer, (5 marks) Calculate the molecular weight for monomers for the Polymer Y. (3 marks) Prove that Polymer Y is a polytetrafluoroethylene (PTFE) with a chemical formula, (CF) Given the atomic weights for carbon, C is 12.011 g/mol, and fluorine, F is 18.998 g/mol (3 marks) Table 1. Molecular weight data of Polymer Y Molecular weight Number fraction Weight fraction range (g/mol) (w) 10,000 - 20,000 0.03 0.01 20,000 - 30,000 0.09 0.04 30,000 - 40,000 0.15 0.11 40,000 - 50,000 0.25 0.23 50,000 - 60,000 0.22 0.24 60,000 - 70,000 0.14 0.18 70,000 -80,000 0.08 0.12 80,000 - 90,000 0.04 0.07