You first need to show the amount of aluminum you have and how much water you need to make a mole ratio. The one that isn't in excess is the limiting reactant
5.6 mol of Al*2/1=11.2 mol Al
6.2 mol of H2O*3/1=18.6 mol H2O
11.2<18.6
Al<H2O
This could be that aluminum is the limiting reactant
:)
