(a) The polymer can be represented as follows.
[-NH-(CH2)4-NH-C(=O)-(CH2)8-C(=O)-]n
The theoretical value for number-average molar mass (Mn) = 25000 g.mol-1
The molecular weight of the repeating monomer (Mo) = 2*15 + 12*14 + 2*28 = 254 g.mol-1
Formula: Mn = Mo/(1-p), where 'p' is the extent of reaction
i.e. 25000 g.mol-1 = 254 g.mol-1/(1-p)
i.e. 1-p = 0.01016
Hence, the extent of reaction (p) = 0.98984
(b) The discrepancy between the theoretical and experimental values can be attributed to the loss of some weight during the process of isolation of the synthesized polymer.
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