Moles

So, what is a mole?  If you haven't been listening, you might think it's a brown furry creature.

However, in chemistry, we have another definition. A mole represents a specific quantity, like 12 somethings equal a dozen.  But it represents a much larger number. 

6.022 x 10^23

1 mole always represents the same number. 
If you have 1 mole of donuts, you will have 6.022 x 10^23 donuts. 
If you have 1 mole of eggs, you will have 6.022 x 10^23 eggs. 

How much is this? Here's a couple examples to help you visualize.
This is the Sahara desert.

This cup of water(aprox. 10 moles) contains more moles of H2O than grains of sand in the Sahara.   

Eg.2) If you took 1 mole of marbles, and covered the Earth's surface with them, the layer would be around 80 km thick.
 

Moles are very important, especially in chemistry because they make counting particles possible.