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tensa zangetsu [6.8K]
3 years ago
8

Naturally occurring chlorine that is put in pools is 75.53 percent 35Cl and 24.47 percent Cl. Calculate the average atomic mass.

Chemistry
1 answer:
LenKa [72]3 years ago
5 0

A_r = 35.5

The average atomic mass of Cl is the <em>weighted average</em> of the atomic masses of its isotopes.  

We multiply the atomic mass of each isotope by a number representing its relative importance (i.e., its <em>% abundance</em>).  

Thus,  

0.7553 × 35 u = 26.4   u

0.2447 × 37 u =   <u>9.05 u</u>  

          TOTAL = 35.5    u  

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