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in Basic Concepts of Chemistry and Chemical Calculations by (44.9k points)
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Calculate the average atomic mass of naturally occurring magnesium using the following data.

Isotope Isotopic atomic mass Abundance (%)
Mg24 23.99 78.99
Mg26 24.99 10
Mg25 25.98 11.01

1 Answer

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Best answer

Isotopes of Mg.

 Atomic mass = Mg24 

= 23.99 x 783.99/100 

= 18.95 

Atomic mass = Mg24 

= 24.99 x 10/100 

= 2.499 

Atomic mass = Mg25 

= 25.98 x 11.01/100

= 2.860 

Average Atomic mass = 24.309 

Average atomic mass of Mg = 24.309

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