Ineed on 3 and 4 i'm very confused and can not answer these questions i'm in sixth grade and it's hard

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.

Enzymes affect the reactions in living cells by changing the

Is 9 correct? and can someone me with 10? it’s due tomorrow, you