3.1 Amount of substance and moles

• One mole of a substance contains the same number of particles as there are atoms in exactly 12g of carbon-12
• The Avogadro's constant is 6.02 x 10^23 particles per mole
• Molar mass is the mass of one mole of a substance in grams
• Moles = mass/molar mass
• Number of particles = moles x Avogadro's constant