a. 0 35. Rubidium has two naturally occurring isotopes, Rb-85 (relative mass 84.9118 amu) with % abundance of 72.05% and Rb-87 (relative mass 86.9092 amu). What is the average atomic mass of Rubidium? a. 85.4701 amu b. 85.9105 amu C. 86.3509 amu d. 86.8911 36. Iron (average atomic mass = 55.8476 amu) has four isotopes: Fe-54, Fe-56, Fe-57, and Fe-58. The first two isotopes have a total abundance of 97.599%, and the last isotope has an abundance of 0.282%. What is the abundance of the first isotope? a. 2.119% b. 8.962% C. 10.232% d. 87.367%

a. 0 35. Rubidium has two naturally occurring isotopes, Rb-85 (relative mass 84.9118 amu) with % abundance of 72.05% and Rb-87 (relative mass 86.9092 amu). What is the average atomic mass of Rubidium? a. 85.4701 amu b. 85.9105 amu C. 86.3509 amu d. 86.8911 36. Iron (average atomic mass = 55.8476 amu) has four isotopes: Fe-54, Fe-56, Fe-57, and Fe-58. The first two isotopes have a total abundance of 97.599%, and the last isotope has an abundance of 0.282%. What is the abundance of the first isotope? a. 2.119% b. 8.962% C. 10.232% d. 87.367%

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

Chapter3: Stoichiometry

Section: Chapter Questions

Problem 43E: The element europium exists in nature as two isotopes: 151Eu has a mass of 150.9196 u and 153Eu has...

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An element consists of 1.40% of an isotope with mass 203.973 u, 24.10% of an isotope with mass 205.9745 u, 22.10% of an isotope with mass 206.9759 u, and 52.40% of an isotope with mass 207.Y766 u. Calculate the average atomic mass, and identify the element.
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