Practice Problem 1: Chlorine’s Average Atomic Mass (6.1)

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6 sample questions

Question 1.
What is an isotope?
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Think about the definition relating to atomic structure.
Question 2.
If chlorine-35 is 75.78% abundant, what is its decimal representation?
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Convert percentage to decimal form by dividing by 100.
3Question 3.
What is the average atomic mass of chlorine based on its isotopes?
- 34.96
- 35.45
- 36.01
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Look closely at the percentages given.
4Question 4.
Isotopes of an element must have the same number of protons?
- True
- False
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Think about what defines an element.
Question 5.
If an unknown element has two isotopes with masses of 50 u and 52 u, and abundances of 75% and 25% respectively, calculate the average atomic mass.
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Apply the same method as we did with chlorine.
Question 6.
Explain how the average atomic mass might differ if the abundances of chlorine-35 and chlorine-37 were reversed.
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Think about how weighting works in averages.

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