Answer:
To determine the number of atoms in 0.28 moles of Beryllium (Be), we need to use Avogadro's number, which is 6.022 x 10^23 atoms per mole.
First, we can calculate the number of moles of Beryllium (Be) in 0.28 moles by multiplying it by Avogadro's number:
0.28 moles x 6.022 x 10^23 atoms/mole = 1.68496 x 10^23 atoms
Therefore, there are approximately 1.68 x 10^23 atoms in 0.28 moles of Beryllium (Be).
Step-by-step explanation: