Atomic Masses

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  • Atomic Masses
    • Relative Isotopic mass
      • The mass of an atom of an isotope compared with one-twelfth of the mass of an atom of carbon-12.
      • Oxygen = 16
      • Hydrogen = 1
    • Relative atomic mass
      • The weighted mean mass of an atom of an element compared with one-twelfth of the mass of an atom of carbon-12
      • Hydrogen = 1
      • Fluorine = 19
    • Relative molecular mass
      • The weighted mean mass of a molecule compared with one-twelfth of the mass of an atom of carbon-12
      • H20  --->   H=1  O=16 1+1+16=18
      • Cl2 --->     35.3 x 2 = 71
    • Relative formula mass
      • The weighted mean mass of a formula unit compared with one-twelfth of the mass of an atom of carbon-12
      • CaBr2 --> 40.1  +    (79.9 x 2) = 199.9
      • Na3Po4 --> (23 x 3) + 31 + (16 x 4) = 164

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