Worksheet #1 Average Atomic Mass

THS Advanced Chemistry

Worksheet #1

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Average Atomic Mass

Use the following data to determine the average atomic mass of each element. Please show all calculations. Round your answers to three decimal places in this activity and box your answer.

1. There are two isotopes of lithium.

Isotope

Lithium-6 Lithum-7

Percent Natural Abundance 7.59 92.41

Atomic Mass (amu) 6.0151223 7.0160040

2. Magnesium has three naturally occurring isotopes.

Isotope

Mg-24 Mg-25 Mg=26

Percent Natural Abundance 78.99 10.00 11.01

Atomic Mass (amu)

23.985042 24.985837 25.982593

3. Argon, a noble gas, has three naturally occurring isotopes.

Isotope

Ar-36 Ar-38 Ar-40

Percent Natural Abundance 0.3365 0.063 99.6003

Atomic Mass (amu)

35.967545 37.962732 39.962384

Revised Autumn 2013

THS Advanced Chemistry

4. Titanium, a very light transition metal, has five naturally occurring isotopes.

Isotope

Ti-46 Ti-47 Ti-48 Ti-49 Ti-50

Percent Natural Abundance 8.25 7.44 73.72 5.41 5.18

Atomic Mass (amu)

45.952629 46.951764 47.947947 48.947871 49.944792

5. Zinc, a transition metal with thirty electrons, has five naturally occurring isotopes.

Isotope

Zn-64 Zn-66 Zn-67 Zn-68 Zn-70

Percent Natural Abundance 48.63 27.90 4.10 18.76 0.62

Atomic Mass (amu)

63.929145 65.9260347 66.9271291 67.9248459 69.925325

6. Chlorine has two naturally occurring isotopes.

Isotope

Chlorine-35 Chlorine-37

Percent Natural Abundance 75.78 24.22

Atomic Mass (amu) 34.9688 36.9659

Revised Autumn 2013

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