# 3.12    Consider the reaction:              What is the quantity of electricity in coulombs needed to reduce 1 mol  of  ?

It is clear from the given reaction that reduction of 1 mol of Cr2O72- will be

=   6 F                                                            (as 6 electrons are required to balance the reaction;  Charge required = nF)

Thus 578922 C charge is required for reduction of 1 mol of Cr2O72- .

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