moles & mass

• Mole

  A unit used to measure the amount of a chemical substance, containing 6.02 x 10^23 particles (atoms, molecules, ions or electrons)
• One mole of any substance contains 6.02 x 10^23 particles
• The mass of one mole of a substance is equal to its relative atomic or formula mass in grams
• Avogadro's constant

  The number of particles in one mole, 6.02 x 10^23
• Chemical equations represent ratios of moles of reactants and products