Please help with these two chemistry questions. Image attached.

Answer:
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