Answer:
5.546262 x 10^24 formula units
Step-by-step explanation:
Use avogadro's number
9.21 mol CaO ((6.022 x 10^23 formula units CaO)/1 mol CaO)) = 5.546 x 10^24.
I rounded to 3 sig figs.
1.6m questions
2.0m answers