Atomic Mass Worksheet - Answer Key

 

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  1. Is atomic mass the same value as the atomic number?

    No.
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  3. How do you calculate the atomic mass of an element?

    Atomic Mass =
    (% abundance of isotope 1)(mass of isotope 1) +
    (% abundance of isotope2)(mass of isotope 2) + …..

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  5. What is the atomic mass of copper if  63Cu has a mass of 62.93 amu and percent abundance of 69.09% and isotope 65Cu has a mass of 64.93 amu and percent abundance of 30.91%.

    63.55 amu
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  7. What are the percent abundances for 151Eu and 153Eu if the atomic mass of the element is 151.96 amu and the isotope masses are 150.9196 amu and 152.9209 amu respectively.

    48%
    52%