Molten aluminium is formed at the electrode where positive Al3+ ions are reduced to aluminium ions. The liquid aluminium runs to the bottom of the cell, where it is tapped off.

Explanation:

this is you questions answered

Now, you know that the sample of sodium metal reacted completely, which implies that it was completely consumed by the reaction.
In other words, you don't have to worry about the sample of chlorine gas because the fact that sample of sodium metal was completely consumed lets you know that the chlorine gas is not a limiting reagent.
This means that the reaction consumed