Average atomic mass worksheet by hedongchenchen

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									                                           Chem 2202

1. Determine the average atomic mass for each of the following:

      Isotope name     Percent abundance                    Average Atomic Mass
 a.
        carbon-12              98.9%


        carbon-13              1.1%


        carbon-14           1.0 x 10-10%

 b.
        oxygen-16             99.762


        oxygen-17              0.038


        oxygen-18               0.2




2. Calculate the average atomic mass of an element. For example, there are two isotopes of boron
      (boron-10 and boron-11). What is the average atomic mass of boron if boron-10 has a
      percent abundance of 19.88% while boron-11 has a percent abundance of 80.22%?


3. There are two naturally occurring isotopes of chlorine: chlorine-35 and chlorine-37. Determine
     the average atomic mass of chlorine if the relative abundance of chlorine atoms in nature is
     75% chlorine-35 and 25% chlorine-37?


4. The average atomic mass of hydrogen is 1.01. Which isotope of hydrogen do you think is most
     abundant in nature? Why?

								
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