• The word mole (symbol, mol) represents a number. Just like dozen or decade.

• A mole is defined as the amount of substance that contains as many elementary particles (atoms, molecules, or ions) as there are atoms in 12 g of carbon-12 isotope. You can learn about the history of why Carbon-12 was chosen through this site.

• The number of atoms or ions in 1 mole of an element or compound is 6.02 x 10²³ and is called Avogadro’s number (N_A).

• The molar mass (M) of an element is defined as the mass of 1 mol of the element expressed in grams per mole (gmol^-1).

• Molar mass is calculated by adding the relative atomic masses (Ar) of each atom of each element present in the formula.

Mole Games

Guided worksheet

Mole Guided Investigation Intro