How many nuclei are there in $1\ kg$ aluminum? (Atomic mass of aluminium $= 26.98153\ amu,\ 1\ amu =1.66\times 10^{-27}kg$)

$2.23\times 10^{26}\text{ nuclei}$

$2.23\times 10^{25}\text{ nuclei}$

$4.46\times 10^{25}\text{ nuclei}$

$4.46\times 10^{20}\text{ nuclei}$