Refer to your periodic table to find the atomic masses of aluminium. Then convert grams to moles by the following formula
Grams/Atomic Mass=Number of moles
For solutions like KOH, take (Amount in mL/1000mL)*Molarity=Amount in moles
Distilled HOH is H20 is 100% water. 1mL of water is one gram.
Now time to go figure and compare it with the equation!