4.5 x 10^25 atoms of nickel equal how many moles? a) 27 mol b) 2.7 x 10^48 mol c) 0.75 mol d) 75 mol

Hello!

To find the number of moles in 4.5 x 10^25 atoms, we need to divide the total number of number by Avogadro's number. His number is 6.02 x 10^23 atoms. This number represents the number of atoms in one mole.

(4.5 x 10^25 atoms) / (6.02 x 10^23) ≈ 74.75083056

Using significant figures, there are about 75 moles in 4.5 x 10^25 atoms of nickel, which is choice D.

indium, and thallium have three electrons i think