Table 3.1 Summary of Mass Terminology
Term
Definition
Unit
isotopic mass
mass of an isotope of an element
amu
atomic mass
molecular
(or formula) mass
molar mass (M)
(also called
atomic weight)
(also called molecular weight)
(also called
gram-molecular weight)
amu
amu
g/mol
average of the masses of the naturally occurring isotopes of an element weighted according to their abundance
sum of the atomic masses of the atoms (or ions) in a molecule (or formula unit)
mass of 1 mole of chemical particles (atoms, ions, molecules, formula units)
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