Mole ConceptMedium
Question
The fractional abundance of Cl35 in a sample of chlorine containing only Cl35 (atomic weight = 34.9) and Cl37 (atomic weight = 36.9) isotopes, is 0.6. The average mass number of chlorine is
Options
A.35.7
B.35.8
C.18.8
D.35.77
Solution
Average mass number = 0.6 × 35 + 0.4 × 37 = 35.8
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