Calculate the average atomic mass of argon to two decimal places, given the following relative atomic masses and abundances of each of the isotopes: argon-36 (35.97 u; 0.337%), argon-38 (37.96 u; 0.063%), and argon-40 (39.96 u; 99.600%)

39.95 u

Explanation:

The formula for the calculation of the average atomic mass is:

Given that:

For first isotope, Argon-36:

% = 0.337 %

Mass = 35.97 u

For second isotope, Argon-38:

% = 0.063 %

Mass = 37.96 u

For third isotope, Argon-40:

% = 99.600 %

Mass = 39.96 u

Thus,  

Average atomic mass = 39.95 u

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