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Example 12.1.2: chlorine consists of 75% chlorine-35 and 25% chlorine-37. Think of the data based on 100 atoms, so 75 have a mass of 35 and 25 atoms have a mass of 37. The average mass = [ (75 x 35) + (25 x 37) ] / 100 = 35.5 . So the relative atomic mass of chlorine is 35.5 or . Ar(Cl) = 35.5. The mass number for any isotope ................
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