  ## The mole is used in measurements similar to the “dozens”.

• The reason why we use moles in chemistry is because of the vast number of molecules and atoms involved in the calculations.
• The number is huge and unimaginable, a bit like the number of stars in the galaxy.
• Using the mole unit helps simplify calculations.
• So instead of having to write 6.02 × 10^23 number of particles or atoms, you could write 1 mole of particles or atoms instead.

## 1 mole of atoms ## The Mole Shop    ## The mole is equal to 602 thousand billion billion! 1 mole = 602,000,000,000,000,000,000,000. By From a drawing by C. Sentier, executed in Torino at Litografia Doyen in 1856. (Edgar Fahs Smith collection) [Public domain], via Wikimedia Commons
Amadeo Avogadro was an Italian physicist who was honored for his contribution for his molecular hypothesis in the gas law. The concept of the mole was introduced long after his death.

The mole is a representation of the number which happens to be the same number of atoms found in 12 grams of carbon.

The AVOGRADRO CONSTANT is a very important number in physics and chemistry and you will see it pops up frequently. It’s important to memorize this number (6.022 x 1023) so you can easily recall it for your calculations.

## Mole to Mole Comparison

It is important to know that 1 mole represents the same number but not the same mass. items total number of items

in 1 mole

total mass in

1 mole