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12 cards from this deck
Mass of 1 atom compared to 1/12 mass of C-12 atom
1/12th the mass of a carbon-12 atom
Weighted average of all isotopes of element
Ar: weighted avg; mass number: single isotope only
(mass×abund)+...total abund\frac{(\text{mass} \times \text{abund}) + ...}{\text{total abund}}total abund(mass×abund)+...
Chlorine-35 and Chlorine-37
75% Chlorine-35, 25% Chlorine-37
35.5
Different isotopes contribute to weighted average
Periodic table
Mr, moles, empirical formulas, molecular formulas
Moles=MassAr or Mr\text{Moles} = \frac{\text{Mass}}{\text{Ar or Mr}}Moles=Ar or MrMass
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