Moles

can count molecules or atoms, need to consider how many atoms per molecule

in real chemistry numbers of atoms + molecules are very large

we use the “mole” as a counting unit to represent numbers of chemicals

1 mole = 6.022 × 10²³ - Avogadro’s number (just like dozen =120)

can also link moles to mass, the mass on periodic table is mass in grams for 1 mol of those atoms