# Problem: Magnesium has three naturally occurring isotopes with the following masses and natural abundances:Isotope Mass (amu)  Abundance (%)Mg-2423.985078.99Mg-2524.985810.00Mg-2625.982611.01Calculate the atomic mass of magnesium.

###### FREE Expert Solution

We can use the following equation:

where atomic mass = average atomic mass of the element and f.a. = fractional abundance of the isotope. To get f.a., we simply need to divide the given percent abundance by 100.

79% (294 ratings) ###### Problem Details
Magnesium has three naturally occurring isotopes with the following masses and natural abundances:

 Isotope Mass (amu) Abundance (%) Mg-24 23.9850 78.99 Mg-25 24.9858 10.00 Mg-26 25.9826 11.01

Calculate the atomic mass of magnesium.

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