Question

3 moles = ? molecules

Answer 1

how many moles is 1.204 x 10^24?

Answer 2

You both NEED Avogadro's number.
In one case multiply by 3.
In the other, DIVIDE your quantity by it.

Answer 3

NA = 6.022 141 79×10^23 mol−1

Answer 4

To make the answer a bit more clear... 6.02 * 10^23 is the number of atoms in 1 mol. so 3 moles is 3 times that number