The Mole!

Relating Mass to Numbers of Atoms
The Mole!
the amount of a substance that contains as many particles as there are atoms in exactly 12 g of carbon-12
or
the amount of a substance that contains Avogadro’s number of particles

Avogadro’s Number
The number of particles in exactly one mole of a pure substance.
experimentally determined by Avogadro
1 mole = 6.022 136 7 x 10 23 particles
analogous to 1 dozen of something

Molar Mass
The mass of one mole of a pure substance.
Units are g/mol
Molar mass of an element is equal to the atomic mass of the element in amu.
Example:
1 atom of carbon has a mass of 12.01 amu.
1 mole of carbon atoms have a mass of 12.01 g/mol
Molar mass of a compound is calculated by adding the masses of all elements in the compound.

Mole Conversions
If it’s the number of things you wonder, it’s time to use Avogadro’s number!
1 mole = 6.022 x 10 23 things
(“things” can be atoms, molecules, ions, formulas units, etc.)
When you go from moles to mass, use the formula mass to pass!
1 mole = formula mass in g
(find it on the periodic table or add it up)

The Mole!

by Paul Schumann

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