quantitive chemistry (3)

• law of conservation of mass


  no atoms are lost or made during a chemical reaction so the masnnof the products = the mass of the reactants
• relative formula mass of a compound

  sum of the relative atomic masses of the atoms in the numbers shown in the formula
• mr in a balanced chemical equation


  sum of mr of reactants in quantities shown=sum of mr of products in quantities shown
• what are chemical amounts are measured in...

  moles
• mass= Mr x ?

  moles
• avogrado constant 


  6.02x10^23
• limiting reactant 


  the reactant that is used up
• mass = conc x ?


  vol
• percentage yield=


  (amount of product produced/ maximum amount of product possible) x100
• atom economy


  a measure of the efficiency of a chemical reaction
• conc = mol / ?


  vol