Question

Determine the number of moles in each of the following?

`1.49 x 10^23` formula units sodium hydroxide

`1.17 x 10^25` copper(II) ions

Answer 1

Please refer to the explanation for the answers.

Explanation:

Well, a mole of any substance is defined as `6.02*10^23` quantities of those substances.

So, `1.49*10^23` formula units of sodium hydroxide `(NaOH)`, will equal to

`(1.49*10^23)/(6.02*10^23)~~0.25` moles of `NaOH`

We can now do the same process for the copper(II) ions `(Cu^(2+))`.

`1.17*10^25` copper(II) ions is equal to

`(1.17*10^25)/(6.02*10^23)~~19.44` moles of `Cu^(2+)` ions.