Chlorine has two naturally occuring isotopes, the 35Cl and the 37Cl.
Cl-35 weighs 34.969 amu and has a relative abundance of 75.53% while Cl-37 weighs 36.966 amu
and occurs 24.47 percent in nature. Find the atomic weight for Cl.
(0.7553)(34.969 amu) + (0.2447) (36.966 amu) = 35.46 amu
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