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12 cards from this deck
112\frac{1}{12}121 the mass of a carbon-12 atom
Abundance of each isotope of the element
Weighted average of all isotopes
Mass number is one isotope; Ar is weighted average
Sum of (mass ×\times× abundance) / total abundance
It's a weighted average of different isotopes
On the periodic table
Moles=MassAr or Mr\text{Moles} = \frac{\text{Mass}}{\text{Ar or Mr}}Moles=Ar or MrMass
Chlorine-35 and Chlorine-37
75% Cl-35 and 25% Cl-37
35.5
Relative atomic masses (Ar) of elements
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