Chemistry
Chemistry
10th Edition
ISBN: 9781305957404
Author: Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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Concept explainers

Atoms and Molecules
An atom is the smallest unit of an element that possesses all the properties of that particular element. Molecules are the smallest unit of a substance that possess all the properties of that particular substance.
Question

An imaginary element Saturnium, St,  consists of two isotopes having masses of 101.0 amu and 104.0 amu. A sample of Saturnium was found to contain 60.0% of the St-101. What is the atomic mass of Saturnium?

  1. A) 102.5 amu
  2. B) 102.2amu
  3. C) 104.0 amu
  4. D) 102.8 amu
  5. E) missing information
Expert Solution
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Step 1

Recall the relation to calculate atomic mass of Saturnium as follows

Atomic mass of Saturnium=% of St-101×mass of isotope St-101+% of St-104×mass of isotope St-104100Here, mass of isotope St-101 is 101.0 amu     and mass of isotope St-104 is 104.0 amu     % of isotope St-101 is 60.0%    So,% of isotope St-104 is=100-60.0%                                             =40.0 %

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