quantitative chemistry

• calculating RAM


  (isotope1 x %) + (isotope2 x %) / 100
• relative atomic mass

  • the mass of an atom is too small to work with so we use the relative mass
  • everything is compared to 1/12 or carbon-12 as it has a mass of exactly 12
• calculating moles


  grams/rams
• percentage composition


  part/total x 100
• avogadros constant


  6.02 x 10(23)
• percentage yield

  • the amount of product you actually make as a % of the amount you should theoretically make.
  • actual yield/predicted yield x 100%
• atom economy


  relative molecular mass of desired product/sum of Mr of all reactants x 100

  use big numbers