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12 cards from this deck
1/12th the mass of a carbon-12 atom
Abundance of each isotope
Weighted average of all isotopes
Mass number = one isotope; Ar = weighted average
Ar=∑(mass×abundance)total abundance\text{Ar} = \frac{\sum(\text{mass} \times \text{abundance})}{\text{total abundance}}Ar=total abundance∑(mass×abundance)
75%
25%
35.5
Different isotopes contribute to weighted average
On the periodic table
Moles=MassAr or Mr\text{Moles} = \frac{\text{Mass}}{\text{Ar or Mr}}Moles=Ar or MrMass
Relative formula mass (Mr)
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