If six moles of hydrogen chloride (HCl) react with plenty of aluminum, how many moles of aluminum chloride (AlCl3) will the reaction produce?

Answer:
(a)
Explanation:
6HCl + 2Al ---> 2AlCl3 + 3H2
6 mol 2 mol
As we can see 6 mol HCl produce 2 mol AlCl3.