Formula Mass and Mass Calculations

Relative Formula Mass

• Relative atomic mass (Ar) is how heavy an atom is - found on the peroidic table
• Relative formula mass (Mr) is the combined Ar of a compound
  
  
• One Mole of a substance is the Mr in grams 

number of moles = mass (g) / Mr

Mass Calculations

% Mass

  % mass of an element in a compound = Ar * number of atoms (of element) / Mr (of compound)

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