A Chemistry student at Agora is calculating the average atomic mass of Potassium using the following data. Isotope K-39 K-41 Relative abundance 93.12 % 6.88% Their setup and calculation are. Mass (amu) 38.964 40.962 Atomic Mass 38.964 amu 40.962 amu Relative Abundance (% divide by 100) 0.0688 0.9312 = 2.681 38.144 40.823 amu = The student calculated the average atomic mass to be 40.823 amu but it is 39.098 amu on the periodic table.

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
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Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Explain what the student did incorrectly
1.
A Chemistry student at Agora is calculating the average atomic mass of Potassium using the following data.
Isotope
K-39
K-41
Relative abundance
Mass (amu)
Their setup and calculation are.
93-12%
6.88%
38.964
40.962
X
Atomic Mass
38.964 amu
40.962 amu
Relative Abundance (% divide by
100)
What did the student do incorrectly? Use CER!
0.0688
0.9312
= 2.681
= 38.144
40.823 amu
The student calculated the average atomic mass to be 40.823 amu but it is 39.098 amu on the periodic table.
Transcribed Image Text:1. A Chemistry student at Agora is calculating the average atomic mass of Potassium using the following data. Isotope K-39 K-41 Relative abundance Mass (amu) Their setup and calculation are. 93-12% 6.88% 38.964 40.962 X Atomic Mass 38.964 amu 40.962 amu Relative Abundance (% divide by 100) What did the student do incorrectly? Use CER! 0.0688 0.9312 = 2.681 = 38.144 40.823 amu The student calculated the average atomic mass to be 40.823 amu but it is 39.098 amu on the periodic table.
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