What the volume of the container needed to store 0.8 moles of argon gas at 5.3 atm and 227*c ( given r=0.08205lx atm/mol x k)

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.

If 10.g of agno3 is available, what volume of 0.25 m agno3 can be prepared

Which of the following represents the ester functional group? a. -coo- b. -cho c. -cooh d. c=o