An acid solution of KReO4 sample containing 26.0 mg of combined rhenium was reduced by passage through a column of granulated zinc. The effluent solution, including the washings from the column, was then titrated with 0.1 N KMnO4; 11.0 mL of the standard permanganate was required for the oxidation of all the rhenium to Per-Rhenate ion, ReO4−. Assuming that rhenium was the only element reduced, find the number of electrons transferred per Re atom in the zinc column? [Assume atomic weight of Re to be 190].