Chlorine has two isotopes, 35cl and 37cl; 75.77% of chlorine is 35cl, and 24.23% is 37cl. the atomic mass of 35cl is 34.969 amu, and the atomic mass of 37cl is 36.966 amu. what is the atomic weight of chlorine?

The average atomic mass of chlorine is 35.45 amu

Explanation:

Mass of isotope - 35 = 34.969 amu

% abundance of isotope-35 = 75.77% =

Mass of isotope - 37 = 36.966 amu.

% abundance of isotope-37  = 24.23% =

Formula used for average atomic mass of an element :

Therefore, the average atomic mass of chlorine is 35.45 amu

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