Skills

• percentage by mass

  add up atoms for desired element ÷ by all atoms
• moles

  mass ÷ molar mass
• relative atomic mass

  total mass of atoms ÷ total number of atoms
• relative formular mass

  add up all the atoms
• percentage yield


  actual ÷ predicated × 100
• relative mass for isotopes

  (isotope 1 mass × abundance) + (isotope 2 mass × abundance) ÷ 100