Calculates the average atomic mass of an element based on the masses and natural abundances of its isotopes.
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Enter Isotope 1 Mass (amu), Isotope 1 Natural Abundance (%), Isotope 2 Mass (amu), Isotope 2 Natural Abundance (%), Isotope 3 Mass (amu) (Optional), and Isotope 3 Natural Abundance (%) (Optional) in the units shown.
Read Average Atomic Mass in the results panel. Results update as you change the inputs.
Choose a preset to load an example, then adjust the values for your situation.
See the inputs and their calculated results.
Isotope 1 Mass (amu): 1.007825 amu; Isotope 1 Natural Abundance (%): 99.9885 %; Isotope 2 Mass (amu): 2.014102 amu; Isotope 2 Natural Abundance (%): 0.0115 %; Isotope 3 Mass (amu) (Optional): 0 amu; Isotope 3 Natural Abundance (%) (Optional): 0 %
Average Atomic Mass: 1.007940722 amu
Isotope 1 Mass (amu): 12 amu; Isotope 1 Natural Abundance (%): 98.93 %; Isotope 2 Mass (amu): 13.003355 amu; Isotope 2 Natural Abundance (%): 1.07 %; Isotope 3 Mass (amu) (Optional): 0 amu; Isotope 3 Natural Abundance (%) (Optional): 0 %
Average Atomic Mass: 12.0107359 amu
Isotope 1 Mass (amu): 15.994915 amu; Isotope 1 Natural Abundance (%): 99.76 %; Isotope 2 Mass (amu): 16.999132 amu; Isotope 2 Natural Abundance (%): 0.038 %; Isotope 3 Mass (amu) (Optional): 17.999161 amu; Isotope 3 Natural Abundance (%) (Optional): 0.2 %
Average Atomic Mass: 15.9989852 amu
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