Chemistry 2.1.3 Atomic masses

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  • Created by: AabirA
  • Created on: 03-04-17 14:10
Unified atomic mass unit, u
1u = 1.66 x 10^-27 kg. The mass of a carbon-12 atom is 12u; therefore, the mass of a twelfth of a carbon-12 atom is 1u.
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Relative isotopic mass
The mass of an atom of an isotope compared with one-twelfth of an atom of carbon-12.
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Relative atomic mass, Ar
The weighted mean mass of an atom of an element compared with one-twelfth of the mass of an atom of carbon-12.
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Relative molecular mass, Mr
The sum of the relative atomic masses of each atom making up a molecule
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Relative formula mass
The sum of the relative atomic masses of each atom making up a formula unit
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Other cards in this set

Card 2

Front

The mass of an atom of an isotope compared with one-twelfth of an atom of carbon-12.

Back

Relative isotopic mass

Card 3

Front

The weighted mean mass of an atom of an element compared with one-twelfth of the mass of an atom of carbon-12.

Back

Preview of the back of card 3

Card 4

Front

The sum of the relative atomic masses of each atom making up a molecule

Back

Preview of the back of card 4

Card 5

Front

The sum of the relative atomic masses of each atom making up a formula unit

Back

Preview of the back of card 5

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