How To Calculate The Average Atomic Mass Complete Guide

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how to calculate the average atomic mass. Use the atomic mass scale to express the mass of atoms in atomic mass units amu. The weighted average of the isotopes of each element grounded in nature by their abundance is the atomic weight of an element.

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Next determine the masses of each isotopeUsing the same example above this would be 35 and 37 amu respectively. To accomplish this we usually use an approach called the weighted average. The atomic mass is the weighted average of the atomic masses of each isotope.

12000000 09890 13003355 00110 12011 amu.

To calculate the average mass first convert the percentages into fractions divide them by 100. You need to know the mass of each isotope and the percent abundance of each as well. Heres how I do it. In this problem the percent abundance represents the relative importance of each isotope.