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Magnesium has three naturally occurring isotopes: Mg-24 with mass 24.3050 amu and a natural abundance of 78.99 %, Mg-25 with mass 24.9858 amu and a natural abundance of 10.00 %, and Mg-26 with mass 25.9826 amu and a natural abundance of 11.01 %.
Calculate the atomic mass of magnesium.

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Apocrophon
What you do here is you multiply the weight of the isotope by its abundance and add up what you get to get the atom's abundance.

[tex](24.3050*.7899)+(24.9858*.1000)+(25.9826*.1101)= 25.55778[/tex]
So the abundance is 25.5578 amu.

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