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Theoretical element “A” has four isotopes. Use the data in the table to calculate the average atomic mass of the unknown element A. All steps of the calculations must be shown for credit.

Isotope Atomic Mass Abundance
A - 49 49.022 amu 89.89%
A - 48 48.031 amu 7.01%
A - 47 48.007 amu 3.00%
A - 46 46.001 amu 0.10%

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From the calculations, the average atomic mass of the element is 48.85.

What is the percentage abundance?

The percentage abundance has to do with the amount of an isotope that is available in nature.

Since we have the following mass abundance;

A - 49 49.022 amu 89.89%

A - 48 48.031 amu 7.01%

A - 47 48.007 amu 3.00%

A - 46 46.001 amu 0.10%

The average atomic mass =

(0.8989 * 49.022) + (0.0701 * 48.031 ) + (0.03 * 48.007) + (0.001 * 46.001 )

= 44 + 3.4 + 1.4 + 0.05

= 48.85

Learn more about average atomic mass:https://brainly.com/question/13753702

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