Chemistry KEY TERMS
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Relative Isotopic Mass
The mass of an atom of an isotope compared with one twelfth of a mass of an atom of Carbon-12 (= 12 C)
Relative Atomic Mass
The relative atomic mass is the weighted mean mass of an atom of that element relative to one-twelfth of the mass of an atom of carbon-12.
Relative Molecular Mass
Mr, is the weighted mean mass of a molecule compared with one twelfth of the mass of an atom of carbon-12.
Relative Formula Mass
Relative formula mass is the weighted mean mass of a formula unit compared with one-twelfth of the mass of an atom of carbon-12.
Amount of a substance...
... is the quantity whose unit is the mole.
...is the amount of any substance containing as many particles as there are in carbon atoms in exactly 12g of the carbon-12 isotope.
Molar Mass ...
- ... M, is the mass per mole of a substance. The Unit: gmol-1
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