The Mole Concept

• A mole of a substance is the amount that contains the same number of units as the number of carbon atoms in 12 grams of carbon-12
• A mole is the Ar or Mr expressed in grams e.g. 1 mole of Carbon-12 is equal to 12 grams.
• A mole is equal to 6.02 × 1023 particles, this number is called Avogadro’s constant.