Please help with these two chemistry questions. Image attached.

The answer to your question is

Explanation:

Question 8

To find the mass of a compound if we have the number of moles, we must use the molar mass of that compound (g/mol) and use proportions or a rule of three to find the mass.

Solution: g/mol of Calcium carbonate

Question 9

Use a rule of three to find the answer

                      1 mol 22.4 L

                     0.98 moles  x

                      x = (0.98 x 22.4) / 1

                      x = 21.952 L ≈ 22 L

Solution: 22 L

that's what i got you can count the number of atoms