calculated average atomic mass with an element on the periodic table.

Chemistry
Tutor: None Selected Time limit: 1 Day

Isotope

Atomic Mass(amu)

Abundance

Calculation

A-33

34.66

3%

Sep 29th, 2015

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For one to calculate the average atomic mass of an element, their must be two or more isotopes of the element in existence. From the given weights (atomic mass unit) and the respective abundance, the average atomic mass can be calculated. In order to get the average mass, the atomic mass of each isotope is multiplied by its respective abundance (expressed as a decimal) and the results summed together to get the average atomic mass. For example, in this case, {34.66 x (3/100)} + {atomic mass of the second isotope x abundance}

Note that the percentage abundance is first converted into a decimal before multiplying with the atomic mass (weight)

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Sep 29th, 2015

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Sep 29th, 2015
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