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12 cards from this deck
Compares atom mass to carbon-12 standard
Ar
Carbon-12 atom
Periodic table
No units - just numbers (they are relative)
Total relative mass of a compound
Mr
Multiply Ar by atom count, then add all values
12
16
(1×12)+(2×16)=44(1 \times 12)+(2 \times 16)=44(1×12)+(2×16)=44
Same method, using numbers in formula
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