For the reaction3Br2+6OH−⟶Br−+BrO3−1+3H2OCalculate the equivalent weight of Br, (molecular weight)

Br2 disproportionates (simultaneous oxidation and reduction), its equivalent weight is the sum of equivalent weight of the two half reactions.    2e−+Br2⟶2Br−(x=2) (reduction)     Br2⟶2BrO3−+10e−(x=10) (oxidation) ∴     Ew=M2+M10.