We need the reading for this I think
1 mole ------------- 22.4 L ( at STP)
?? moles --------- 5.58 L
5.58 x 1 / 22.4 => 0.249 moles of N₂
A picture of the electroplating apparatus can be found attached. The nail (cathode) is completely submerged and that is where reduction happens. In the other side, the copper strip is (anode) where oxidation happens. The electron flow happens from the anode to the cathode. The positive charge of the battery is attached to the anode while the negative side is attached to the cathode.
It depends on their energy levels.