Question

How many moles are in 7.12 x 10^21 atoms of iron?

Answer 1

To Find :

How many moles are in
`7.12 * 10^(21)` atoms of iron.

Given :

We know, 1 mole of any element or compound contains exactly
`N_A` ( Avogadro's Number ) atoms/compound .

Now,
`N_A = 6.022 * 10^(23)`

So, number of moles in given number of atoms are :

`n = (6.022 * 10^(23))/(7.12 * 10^(21))\\\\n = 1.18 * 10^(-2) \ mol`

Hence, this is the required solution.