Verified answer

Using " Mole Definition "

Number of Moles of 6.2 × 10^24 atoms of Aluminium

= 6.2 × 10^24 atoms / ( 6.02 x 10^23 atoms / mole )

= 10.299 Moles

you employ Avogadro's type (6.02x10^23) to transform atoms to moles. So: 5.6x10^24 atoms Al x a million mol/6.02x10^23 atoms= 9.30 moles of Aluminum, in case you needed to transform moles of Al to grams, only multiply by the molecular mass of Al. wish that helps!

10.

you divide 6.2X10^24 by one mole (which is 6.2X10^23), and you get 10.