Moles

• Chemical amounts are measured in moles
• The symbol for the unit of moles is mol
• The mass of one mole of a substance, in grams, is numerically equal to its relative formula mass
• number of moles = mass of substance / Mr of substance
• One mole of a substance contains the same number of:

  • particles
  • atoms
  • molecules
  • ions


  as one mole of any other substance given
• The number of atoms, molecules, or ions in a mole of a given substance is the Avogadro constant
• The value of the Avogadro constant is 6.022 x 10^23 per mole
• For example:

  The number of atoms in one mole of carbon (C) is the same as the number of molecules in one mole of carbon dioxide (CO2)