How many atoms of iron are there in a 30 g bowl of cornflakes that contains 0.0024 g iron per 30 g serving? - Leaving Cert Chemistry - Question d - 2010

Next, to convert moles of iron to atoms, we use Avogadro's number ($N_A = 6.022 \times 10^{23} \, atoms/mol$):

$N = n \times N_A$

Substituting the known values:

$N = 4.29 \times 10^{-5} \, mol \times 6.022 \times 10^{23} \, atoms/mol = 2.6 \times 10^{19} \, atoms$

Thus, there are approximately $2.6 \times 10^{19}$ atoms of iron in the 30 g bowl of cornflakes.