Calculate the quantity of electricity needed to reduce one centimole of dichromate in acid medium, to chromic state.

Explanation

The stoichiometric equation is , `Cr_2 O_(7)^(2-) + 14H^(+) + 6e^(-) to 2Cr^(3+) + 7H_2O`
One mole of dichromate = 6 mole of electrons = 579000 coul.
Quantity of electricity required to reduce one centimole of `Cr_2 O_(7)^(2-) ` to `Cr^(3+) = 5790` coul.