Answered: There are three isotopes of an element,…

Chemistry & Chemical Reactivity

10th Edition

ISBN:9781337399074

Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel

Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel

Chapter2: Atoms Molecules And Ions

Section2.2: Isotopes And Atomic Weight

Problem 2.3CYU: Neon has three stable isotopes, one with a small abundance. What are the abundances of the other two...

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Question

There are three isotopes of an element, X-28, X-29, and X-30, with relative abundances of 92.2297%, 4.6832%, 3.0872%, respectively. What is the average atomic mass in amu of this element using four significant figures?

Expert Solution

Step 1

Given

molar mass of X₁= 28 with abundance 92.2297%

molar mass of X₂ = 29 with abundance 4.6832%

molar mass of X₃ = 30 with abundance 3.0872%

average atomic mass of element is the sum of the masses of its isotopes with each multiplied with its natural abundance.

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