Isotopes Lab.doc

# 3 what information do you need to calculate the

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3. What information do you need to calculate the average atomic mass of an element? 4. Was the mass of 20 pennies equal to 20 times the mass of one penny? Explain. 5. In what year did the mass of pennium change? How could you tell? 6. How can you explain that there are different “isotopes” of pennium? Refer back to your M&Mium data and answer the following question. 7. Why was the average atomic mass of red different from the average atomic mass of brown?

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Applications: Answer the following questions. 8. Why are the atomic masses for most elements NOT whole numbers? 9. How are the 3 isotopes of hydrogen (H-1, H-2, and H-3)… ALIKE DIFFERENT 10. Copper has 2 isotopes, copper-63 and copper-65. The percent abundance of copper-63 is 69.1% and that of copper-65 is 30.9%. Find the average atomic mass of copper. 11. Lithium has 2 isotopes, Li-6 and Li-7. The percent abundance of Li-6 is 7.42% and that of Li-7 is 92.58%. Find the average atomic mass of Li. 12. Silver has 2 isotopes, Ag-107 and Ag-109. The percent abundance of Ag-107 is 51.35% and that of Ag-109 is 48.65%. Find the average atomic mass of silver.
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