Chemistry Mass: Molar Mass and Moles:

When the formula weight of an ionic compound is determined by the addition of its component relative atomic masses and expressed in grams, it is called the gram formula weight or Molar Mass. For example CaCO3.


1Ca = 40
1C = 12
3O = 48 = (3*16)
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 CaCO3 = 100 formula weight
100g = Molar Mass