A researcher wants to prepare 200 g of poly(tetrahydrofuran) with a molecular weight of 12,000 g/mol via cationic ring-opening polymerization of tetrahydrofuran. The polymerization is performed at 0°C using boron trifluoride etherate as catalyst, water as cocatalyst, and ethylene dichloride as solvent. 

a) Calculate the molar amount and mass of boron trifluoride to prepare this polymer assuming that the efficiency of the initiator is 90%. Using chemical drawings, showthe initiation mechanism.

b) Calculate the mass and molar amount of tetrahydrofuran required if the expected monomer conversion is 90%. 

c) At the end of the polymerization, a monomer conversion of 95% was observed. Calculate the expected molecular weight of the polymer. 

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