Why is conductivity be the best test to find a metal, non-metal or metalloid? ?

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.

Why are the trends and exceptions to the trends in ionization energy observed?

C3h8o3 - glycerol major species present when dissolved in water