13. Imaginary element mccourtium has an average atomic mass of 157.22 u. The atomic masses and % abundance of three of its four isotopes are given in the table below. Isotope Atomic Mass (u) % Abundance Mc-154 154.80 2.6 Mc-155 155.20 8.2 Мc-157 157.40 81.3 Мc-158 ?? ?? a) Using the data in the table, calculate the % abundance of the Mc-158 isotope. (Show your work.) b) Using the data in the table, as well as your result from part a, calculate the atomic mass of the Mc-158 isotope. (Show your work.) (Be careful when substituting - what is your unknown in the equation this time, and what do you already know?)

13. Imaginary element mccourtium has an average atomic mass of 157.22 u. The atomic masses and % abundance of three of its four isotopes are given in the table below. Isotope Atomic Mass (u) % Abundance Mc-154 154.80 2.6 Mc-155 155.20 8.2 Мc-157 157.40 81.3 Мc-158 ?? ?? a) Using the data in the table, calculate the % abundance of the Mc-158 isotope. (Show your work.) b) Using the data in the table, as well as your result from part a, calculate the atomic mass of the Mc-158 isotope. (Show your work.) (Be careful when substituting - what is your unknown in the equation this time, and what do you already know?)

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

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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[Atomic mass and isotopes] An unknown element has two naturally occurring isotopes: X- 69 and X-71. The mass of X-71 is 70.9163 amu, and its natural abundance is 49.31%. Calculate the mass and natural abundance of X-69. (Hint: The atomic mass of this unknown element is 69.90 amu.) Isotope mass (amu) natural abundance (%) X-69 X-71 70.9163 49.31
engine.html?ClassID=984223440 How many isotopes are represented for the element in this mass spectrum? Unknown Element Relative Abundance 1001 50 81 83 85 87 89 Mass (M/e) There are [?] stable isotopes. ational Academy of Science. All Rights Reserved. O 9 Enter
Element: Lead Number of Number of Abundar (decima Name of isotope Mass (amu) Abundance Protons Neutrons (%) Lead-204 203.973 Lead-206 205.974 24.10% Lead-207 206.976 22.10% Lead-208 207.977 52.40% Isotope Mass Abundance
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