1. How many molecules are in 3.00 moles of H.0?

1.8 ⋅ 10 24  molecules

Explanation:

As you know, a mole is simply a very, very large collection of molecules.

In order to have one mole of a molecular substance, you need to have  

6.022

⋅

10

23

molecules of that substance  

→

this is known as Avogadro's number and it can be used as a conversion factor to go from number of molecules to moles and vice versa.