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Question

Calculate the reported average elemental atomic mass of Mg, if the naturally occurring isomers are 24Mg, 25Mg, and 26Mg. Their masses and abundance are as follows:
IsotopeAtomic MassIsotopic Abudance24Mg23.9850478.70%25Mg24.9858410.13%26Mg25.9825911.17%

A
24.65 amu
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B
24.31 amu
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C
24.82 amu
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D
24.90 amu
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Solution

The correct option is B 24.31 amu
The average elemental atomic mass of Mg will be
=23.98504×0.787+24.98584×0.1013+25.98259×0.1117
=24.309 amu

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