2 Al (s) + 6HCl (ag)→2 AICh (aq) + 3H₂(g)
How many grams of aluminum should be added to 400.0 mL of 2.75 M HCl(aq) to reduce
the concentration of the HCl solution to 2.50 M by the time all the aluminum has been
consumed? [Assume no change in the volume of the solution as a result of the reaction.]