How many coulombs of electricity is required to reduce 1 mole of $C{r}_2{O}_7^{2-}$ in acidic medium

In acidic medium, dichromate ions are reduced according to the equation,${\mathbf{Cr}}_2{\mathbf{O}}_7^{-2}+\mathbf{14}{\mathbf{H}}^{+}+\mathbf{6}\mathbf{e}-\to \mathbf{2}{\mathbf{Cr}}_3++\mathbf{7}\mathbf{H}\mathbf{2}\mathbf{O}$