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# Calculating Average Atomic Mass - PowerPoint PPT Presentation

Calculating Average Atomic Mass. Unit 9 worksheet 2. Average atomic mass. The decimal number on the periodic table The weighted average of all the isotopes of an element Depends on the percent (relative) abundance and the mass of each isotope Measured in “atomic mass units” (amu). Problem 1.

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### Calculating Average Atomic Mass

Unit 9 worksheet 2

• The decimal number on the periodic table

• The weighted average of all the isotopes of an element

• Depends on the percent (relative) abundance and the mass of each isotope

• Measured in “atomic mass units” (amu)

• Given:

• Element X has 2 isotopes

• Mass = 6 amu and percent abundance = 7.5% (0.075)

• Mass = 7 amu and percent abundance = 92.5% (0.925)

Average atomic mass = [(mass) x (abundance)] + [(mass) x (abundance)]

[(6) X (0.075)] + [(7) x (0.925)]

0.45 + 6.475

6.925 amu

On the periodic table, this is closest to Li, atomic number 3.