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?)

Principles of Modern Chemistry

8th Edition

ISBN:9781305079113

Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Chapter2: Chemical Formulas, Equations, And Reaction Yields

Section: Chapter Questions

Problem 18P: A gaseous binary compound has a vapor density that is 2.53 times that of nitrogen at 100°C and...

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