How many moles of silicon, si, are in 1.45 × 1024 si atoms?

Where can i find naap lab answers sheet/key?

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.

Write the chemical symbols for three different atoms or atomic cations with 27 electrons. asap!