How long must be immersed equipment and utensils and a non-chlorine sanitizing solution

Does anyone know a lot about how to: - calculate mass of magnesium metal - calculate the actual yield of magnesium oxide - calculate the theoretical yield of mgo - calculate the percent yield of mgo - determine the percent yield of mgo - determine the average percent yield of mgo i had to do an online lab and its asking these questions but i have no idea where to start or how to be able to find these things. i can post the chart of the data from the lab or if you can tell me exactly how i can find each.

How many grams of magnesium metal will react completely with 8.3 liters of 5.5m hcl? show all work

Word equation for k(s)+h2o(l) yield koh(aq) + h2(g)