equations

• Molar mass

  • adding up the atomic masses of each atom present in the molecule
  • Mr of CaCO3   = 100.1
• Moles

  Moles = mass % Mr
• reacting amounts

  • Write out a balanced symbol equation for the reaction occurring
  • Moles = Mass % Mr
  • Once you have worked out the number of moles of one reagent, use the ratio within the balanced equation to determine the number of moles of the ‘unknown’ reagent
  • The moles of the ‘unknown’ reagent can then be converted into a mass.
• Concentration

  Concentration = moles % volume
• percentage yield = Actual % theoretical X 100