# How many atoms constitute a #3.50*g# mass of #Cu(NO_3)_2#?

##### 1 Answer

Feb 27, 2017

#### Answer:

Approx.

#### Explanation:

We (i) we work out the molar quantity of

And (ii), we convert this molar quantity to a number of atoms.

In one formula unit of

So we work out the product,

Now by definition, in one mole of stuff there are

And thus moles of atoms,