The element lanthanum has an atomic weight of 139 and consists of two stable isotopes lanthanum-138 and lanthanum-139.The isotope lanthanum-138 has a mass of 138 amu and a percent natural abundance of 8.90×10-2 %.The isotope lanthanum-139 has a percent natural abundance of 99.9 %.What is the mass of lanthanum-139?
The element lanthanum has an atomic weight of 139 and consists of two stable isotopes lanthanum-138 and lanthanum-139.The isotope lanthanum-138 has a mass of 138 amu and a percent natural abundance of 8.90×10-2 %.The isotope lanthanum-139 has a percent natural abundance of 99.9 %.What is the mass of lanthanum-139?
Chemistry: The Molecular Science
5th Edition
ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
Publisher:John W. Moore, Conrad L. Stanitski
Chapter2: Chemical Compounds
Section: Chapter Questions
Problem 22QRT
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The element lanthanum has an atomic weight of 139 and consists of two stable isotopes lanthanum-138 and lanthanum-139.
The isotope lanthanum-138 has a mass of 138 amu and a percent natural abundance of 8.90×10-2 %.
The isotope lanthanum-139 has a percent natural abundance of 99.9 %.
What is the mass of lanthanum-139?
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