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

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

% Natural Abundance Molar Mass
35Cl 75.77 34.9689
37Cl 24.23 36.9659

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Fractional Abundance of 35Cl = 0.7577 and Molar mass = 34.9689 

Fractional Abundance of 37Cl = 0.2423 and Molar mass = 36.9659 

∴ Average Atomic mass = (0.7577x34.9689)amu + (0.2423x36.9659) 

= 26.4959 + 8.9568 = 35.4527

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