Chapter 1, Problem 35P

Aluminum oxide $\left({\text{Al}}_{\text{2}}{\text{O}}_{\text{3}}\right)$ occurs in nature as a mineral called corundum, which is noted for its hardness and resistance to attack by acids. Its density is $\text{3}.{\text{97 g cm}}^{-\text{3}}$ . Calculate the number of atoms of aluminum in $\text{15}.0{\text{ cm}}^{\text{3}}$ corundum.