Question

Determine the number of atoms contained in 4.2 moles of atomic bromine.

Answer 1

Avogadro's number

1 mole = 6.02.10²³ particles (atoms, molecules, ions)

for 4.2 moles:

`\tt 4.2* 6.02* 10^(23)=\boxed{\bold{2.53* 10^(24)atoms}}`