🧪Mole Notes

The mole:

A unit of measure scientists use to count the number of atoms in a certain weight of an element.

• 1 mole = amu weight converted to grams

Example:

        1 lithium mole = 6.943 grams

Moles amount & science

The relative masses of elements can be used to “count” atoms. Because 1 amu = 1 proton/neutron mass, if you measure out a sample equal to an atoms atomic mass in grams, you will always end up with the same amount of atoms.

Sample Quantity → mass = atomic mass (in grams)

Avogadro’s number

Represents the number of atoms/particles within a mole, named after the Scientist who pioneered it, Amedeo Avagadro

1 mole = 6.022 × 10²³ particles

Molar mass

the mass in grams of one mole of a substance (element or compound), expressed in units of grams per mole (𝐠/𝐦𝐨𝐥) represents the mass of 6.022 × 10²³ particles (atoms or molecules) of that substance.

Molar mass allows chemists to convert between the mass of a substance and the number of moles.

It works by summing the atomic masses of all atoms in a formula from the periodic table, allowing chemists to convert between mass and moles for stoichiometric calculations.