hey, I am trying to solve it, and its actually pretty easy.

Here wew go:

Volume of sphere = (4/3)*pi*r^3

density= m/v

Find out how many grams of aluminium atoms make up 8.55* 10^22 atoms, and then solve this through substitution. oK?

Here wew go:

Volume of sphere = (4/3)*pi*r^3

density= m/v

Find out how many grams of aluminium atoms make up 8.55* 10^22 atoms, and then solve this through substitution. oK?