Here's why:
* Avogadro's number (6.022 x 10^23) represents the number of atoms or molecules in one mole of a substance.
* One mole of bromine (Br2) contains 6.022 x 10^23 bromine molecules.
* Each bromine molecule (Br2) contains two bromine atoms.
Therefore, to get the number of bromine atoms, you would multiply the number of moles of bromine by Avogadro's number and then by 2 (for the two atoms in each bromine molecule).
Formula:
Number of bromine atoms = (moles of bromine) x (Avogadro's number) x 2
