# How many moles of lead are in #1.50 * 10^12# atoms of lead?

##### 1 Answer

#### Explanation:

Before doing any calculations, it's worth noting that atoms do not *contain moles*, it's the other way around.

A **mole** is simply a collection of atoms. More specifically, you need to have exactly **one mole** of that element - this is known as *Avogadro's number*.

In your case, you must determine how many moles of lead *would contain*

Well, if you know that one mole of lead must contain

#1.50 * 10^12 color(red)(cancel(color(black)("atoms of Pb"))) * "1 mole Pb"/(6.022 * 10^(23)color(red)(cancel(color(black)("atoms of Pb")))) = color(green)(2.49 * 10^(-12)"moles Pb")#

Here's an excellent video on *Avogadro's number* and *the mole* featuring Professor Martyn Poliakoff from Periodic Videos