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What is meant by the phrase “percent abundance in nature”?

What is meant by the phrase “percent abundance in nature”?

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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What is meant by the phrase “percent abundance in nature”?
Since the abundances are not equal, we cannot do a typical simple average where we just add them up and divide by two. Instead, we need to perform a weighted average. The formula to calculate the average atomic mass is: average atomic mass = [(relative abundance x mass of isotope) Remember that is the symbol for sum. In other words, we will take the sum of the relative abundance of each isotope multiplied by its mass. Example Neon has three naturally occurring isotopes. Symbol Ne-20 Ne-21 Ne-22 Mass Isotopic mass Percent natural number (amu) abundance 20 21 22 19.9924 20.9938 21.9914 90.48% 0.27% 9.25% ….. Remember that mass number is not the same as the atomic mass or isotopic mass! The mass number is the number of protons + neutrons, while atomic mass (or isotopic mass) is the mass if you were to somehow weigh it on a balance.
Transcribed Image Text:Since the abundances are not equal, we cannot do a typical simple average where we just add them up and divide by two. Instead, we need to perform a weighted average. The formula to calculate the average atomic mass is: average atomic mass = [(relative abundance x mass of isotope) Remember that is the symbol for sum. In other words, we will take the sum of the relative abundance of each isotope multiplied by its mass. Example Neon has three naturally occurring isotopes. Symbol Ne-20 Ne-21 Ne-22 Mass Isotopic mass Percent natural number (amu) abundance 20 21 22 19.9924 20.9938 21.9914 90.48% 0.27% 9.25% ….. Remember that mass number is not the same as the atomic mass or isotopic mass! The mass number is the number of protons + neutrons, while atomic mass (or isotopic mass) is the mass if you were to somehow weigh it on a balance.
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