Question

Calculate the number of atoms in a 3.63 × 10^3 g sample of bromine.

Answer 1

Always start with what you're given!

\(\sf 3.63 \times 10^3 \times molar~mass~of~bromine\)
which you can find on the periodic table.
Look up, bromime, which is \(\sf \color{red}{Br}\)
then, multiply by avogadro's number, which is: \(\sf \color{blue}{6.022 \times 10^{23} \frac{atoms}{mol}}\)

Answer 2

Thanks!