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An unknown element X has the following isotopes: 14⁰X (89.00% abundant) and 142X(11.00% abundant). What is the average atomic mass in amu of X?

An unknown element X has the following isotopes: 14⁰X (89.00% abundant) and 142X(11.00% abundant). What is the average atomic mass in amu of X?

College Physics
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
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1 An unknown element X has the following isotopes: 14⁰X (89.00% abundant) and 142X(11.00% abundant). What is the average atomic mass in amu of X? 4 7 +/- 2 LO Time's Up! 5 8 amu 3 6 9 0 Submit Tap here or pull up for additional resources X C x 100
Transcribed Image Text:1 An unknown element X has the following isotopes: 14⁰X (89.00% abundant) and 142X(11.00% abundant). What is the average atomic mass in amu of X? 4 7 +/- 2 LO Time's Up! 5 8 amu 3 6 9 0 Submit Tap here or pull up for additional resources X C x 100
Expert Solution
Step 1

the average atomic mass of isotope can be calculated by-

summation over atomic mass* fraction of isotopes

fractional abundance of 140X= 0.89

fractional abundance of 142X = 0.11 

 

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