How are you finding the moles of the unknown substance when you are only given the grams of the unknown molecular compound?

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.

In saturated organic compounds, all the bonds between carbon atoms are called?

What is the number of neutrons in an atom with atomic mass of 35