chemistry 1.3

• Mole

  A unit that represents a certain number of elementary particles (6.02x10^23 particles)
• Mole


  Analogous to the unit "a dozen" (1 dozen = 12 eggs)
• Particles

  Includes elements, compounds and molecules
• 1 mole of

  • Nitrogen
  • Carbon dioxide
  • Sugar
• Calculating number of particles from moles

  1 mole x 6.02x10^23 = 6.02x10^23 particles
• Atomic mass


  The amount an atom weighs, depends on number of neutrons and protons
• Molar mass

  The mass in grams of 6.02x10^23 particles of a substance, has units g/mol
• Calculating molar mass of a molecule

  Determine number of each type of atom, multiply by their individual molar masses, then add them up
• Equation to determine moles from mass

  n = m/M
• Calculating moles from mass

  n = m/M
• Calculating number of particles from moles

  n x 6.02x10^23 = number of particles
• Equation rearrangements

  n = m/M

  m = nM

  M = m/n