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(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. Calculate the number-average molecular weight (Mn) for the polymer. ii. Calculate the molecular weight for monomers for the Polymer Y. iii. Prove that Polymer Y is a polytetrafluoroethylene (PTFE) with a chemical formula, (C2F4)n. Given the atomic weights for carbon, C is 12.011 g/mol, and fluorine, F is 18.998 g/mol. Table 1. Molecular weight data of Polymer Y Molecular weight Number fraction Weight fraction range (g/mol) (wi) 10,000 20,000 0.03 0.01 20,000 - 30,000 0.09 0.04 0.15 30,000 - 40,000 40,000 - 50,000 50,000 - 60,000 0.11 0.23 0.25 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