topic c3- quantitive chemistry

• relative formula mass (Mr)

  the sum of atomic masses (Ar) of all atoms in a molecular formula
• moles

  • amount of substance that contains 6.02x10^23 particles
  • used as it relates to actual mass (g) with atomic mass
• avagadro's constant

  6.02x10^23
• moles

  mass/ Mr
• mass is always conserved in a reaction
• mass

  Mr x moles
• Mr

  mass/ moles
• concentration

  mass/ volume
• concentration

  the amount of a substance in a volume of solution
• limiting reactants

  • amount of product produced depends on limiting reactants
  • it is the reactant (input) that will run out first in the reaction