How much electricity in terms of Faraday is required to reduce $2 \ mol$ of $MnO_4^{-}$ into $Mn^{2+}$?

When the same quantity of electricity is passed through electrolytic cells containing different electrolytes connected in series,the amount of products obtained at the various electrodes is proportional to their:

How much charge in coulombs is required for the reduction of one mole of $Al^{3+}$ to $Al$?

What is achieved by Faraday using the principles of electrolysis?

What is the number of moles of electrons passed when a current of $5 \ A$ is passed through a solution of $FeCl_3$ for $20 \ minutes$?

The quantity of electricity required to liberate $112 \, cm^3$ of hydrogen at $STP$ from acidified water is