A metal ion uses d2sp3 orbitals when forming a complex. What is its coordination number and the shape of the complex?

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.

0.09 moles of sodium sulfate in 12 ml of solution

What is a metal replacement reaction