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Argon has three naturally-occurring isotopes: 99.6% of 40Ar, with an atomic weight of 39.9624 amu, 0.337% of 36Ar, with an atomic weight of 35.9676 amu, and 0.063% of 38Ar, with an atomic weight of 37.9627 amu. Calculate the average atomic weight of Ar. Round off the answer to six significant figures. Do not include the units.

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Answer:

39.9477amu is the average atomic weight of Argon

Explanation:

The average atomic weight is defined as the sum of the products of the atomic weight of each isotope times its abundance. For the Argon the average atomic weight, X is:

[tex]X = 0.996*^{40}Ar + 0.00337*^{36}Ar+0.00063*^{38}Ar[/tex]

[tex]X = 0.996*39.9624amu + 0.00337*35.9676amu+0.00063*37.9627amu[/tex]

X = 39.9477amu is the average atomic weight of Argon

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