1. Given the data in table shown below, calculate the atomic mass of unknown element X. Then, identify the unknown element, which is used medically to treat some mental disorders. ISOTOPE MASS ( amu) PERCENT ABUNDANCE 6 X 6.015 7.5% 7 X 7.016 92.5%

1. Given the data in table shown below, calculate the atomic mass of unknown element X. Then, identify the unknown element, which is used medically to treat some mental disorders. ISOTOPE MASS ( amu) PERCENT ABUNDANCE 6 X 6.015 7.5% 7 X 7.016 92.5%

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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Concept explainers

Mass Spectrometry

This process is an instrumental method in which a sample is changed to fast moving positive ions by electron bombardment. The charged particles vary due to their different mass to charge ratio and are estimated with the help of this difference. It is also called mass spectroscopy.

Question

100%

The average atomic mass of an element is the sum of the masses of its isotopes, each
multiplied by its natural abundance (the decimal associated with percent of atoms of that
element that are of a given isotope).
Note: amu stands for atomic mass unit, which is a concept very similar to the atomic
mass number but differing slightly. It is a unit for mass of tiny subatomic particles such as
protons and neutrons.
1. Given the data in table shown below, calculate the atomic mass of unknown
element X. Then, identify the unknown element, which is used medically to treat
some mental disorders.
ISOTOPE
MASS ( amu)
PERCENT ABUNDANCE
6 X
6.015
7.5%
7X
7.016
92.5%
2. Boron has two naturally occurring isotopes: boron -10 (abundance = 19.8%, mass =
10.013 amu); boron -11 (abundance = 80.2%, mass = 11.009 amu). Calculate the
atomic mass of boron.
3. Calculate the atomic mass of magnesium. The three magnesium isotopes have
atomic mass and relative abundance of 23.985 amu (78.99%), 24.986 amu
(10.00%), and 25.982 amu (11.01%).
4. Copper is made up of two isotopes, Cu-63 (62.9296 amu) and Cu-65 (64.9278 amu).
Given copper's atomic weight of 63.546, what is the percent abundance of each
isotope?

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