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practice 2 - one with a mass number of 79 The atomic weight...

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CH301 Isotope Calculation Extra Practice Problems 1. There are three isotopes of magnesium. The percent abundance for each isotope is given below: Mg-24 78.70% Mg-25 10.13% Mg-26 11.17% Calculate the expected atomic weight of magnesium. How does this calculated value compare to the value on the periodic table? What are some reasons for any differences? 2. Boron has two isotopes. Calculate the atomic mass of boron given the information below. B-10 10.013 amu 19.6% B-11 11.009 amu 3. Lithium has two main isotopes: Li-6 and Li-7. Find the percent abundance of each isotope. 4. A hypothetical element X has two main isotopes, one with a mass number of 50 and one with a mass number of 52. The atomic weight reported on the periodic table for this element is 51.24. What is the percent abundance of each isotope? 5. A hypothetical element X has two main isotopes, one with a mass number of 76 and
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