# How many moles of aluminum do 6.3*10^-24 aluminum atoms represent?

$1.1 \cdot {10}^{-} 47$ moles
To solve this question you have to use Avogadro's constant which states that one mole of any element contains $6.022 \cdot {10}^{23}$ atoms.
In the given example there are $6.3 \cdot {10}^{-} 24$ atoms, so the number of moles is:
(6.3*10^-24 color(red)(cancel(color(black) "atoms"))) / (6.022*10^23 color(red)(cancel(color(black) "atoms"))/"mol") = 1.1*10^-47 "mol"