It's time for the MOLE :D

What you need to know is...
- equal volumes of different gases has a constant ratio.

Do you know who Amedeo Avogadro is?

It's this guy right here!

His hypothesis is that equal volume of different gases at the same temperature and pressure have the same number of particles! 

Like this! 

So if the particles are the same then the mass ratio is the mass of the particles.

ATOMIC MASS:

- The units for atomic mass are amu , u or daltons.

FORMULA MASS:

- All the units of all atoms in ionic compound are in amu.

MOLECULAR MASS:

- All the units of all atoms in covalent compounds are in amu.

MOLAR MASS:

- molar mass contains atomic/molecular/formula mass and are in grams per mole (g/mol)

       ex. 1 mol of potassium = 39.1

Any pure substances have the same numbers of particles.

This is Avogadro's number: 6.022× 10^{23  PARTICLES} 

                                                                     ^MOLE

FUN FACTS:

Speaking of MOLES... did you know that there's something called a MOLE DAY! 

There's also a "anthem" for that day too! 

Check it out!!!