Calculate the atomic mass (average) of chlorine using the following data

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conceptsofchemistry

#1

Calculate the atomic mass (average) of chlorine using the following data.


#2

Average atomic mass is the sum of the products of fractional abundances of the isotopes and their corresponding mass number.
Average atomic mass,

Average atomic mass,

$\bar { A }$ = 0.7577 x 34.9689 + 0.2423 x 36.9659 = 26.4959 + 8.9568 = 35.4527