Please help me Al + HCl ---> AlCl3 + H2(g)

If you measured the total volume of collected gas over water at 45oC to be 728 ml at a total pressure of 845 torr, how many milliliters of 3.56M HCl would be required to produce the correct amount of Hydrogen?

Magnesium is the limiting reactant in this experiment. calculate the theoretical yield of mgo for each trial. trial 1: trial 2: data mass of empty crucible with lid trial 1: 26.688 trial 2: 26.681 mass of mg metal, crucible, and lid trial 1: 26.994 trial: 2 26.985 mass of mgo, crucible, and lid trial 1: 27.188 trial 2: 27.180