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UTD - CHEM 108 - Isotopes - Class Notes

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UTD - CHEM 108 - Isotopes - Class Notes

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background image Name:      KEY               #: _____ Class: _____ Date: _________________ Isotopes and Average Atomic Mass  Use the information given about each element to determine if the pair of elements are isotopes or 
different elements
.
1. Element D has 6 protons and 7 neutrons. Element F has 7 protons and 7 neutrons.                                         Different  elements 2. Element J has 27 protons and 32 neutrons. Element L has 27 protons and 33 neutrons.                               Isotopes 3. Element X has 17 protons and 18 neutrons. Element Y has 18 protons and 17 neutrons.                             Different  elements 4. Element Q has 56 protons and 81 neutrons. Element F has 56 protons and 82 neutrons.                                Isotopes 5. Element T has an atomic number 20 and mass number 40.            Element Z has an atomic number 20 and mass number 41.                                 Isotopes 6. Element P has an atomic number 92 and mass number 238.                               Isotopes Element S has 92 protons and 143 neutrons. The average atomic mass is the weighted average of all the isotopes of an element.  Determine the 
average atomic mass. 
7. Rubidium is a soft, silvery-white metal that has two common isotopes,  85 Rb and  87 Rb. If the  abundance of  85 Rb is 72.2% and the abundance of  87 Rb is 27.8%, what is the average  atomic mass of rubidium?         85 Rb  0.722 x 85=       61.37                            87 Rb  0.278 x 87=   + 24.186                                        86.556 amu 8. Naturally occurring chlorine that is put in pools is 75.53%  35 Cl and 24.47%  37 Cl. Calculate  the average atomic mass.   
 
35 Cl   0.7553 x 35=     25.4355   37 Cl    0.2447 x 37=    +9.0539                                  34.4894 amu 9. Copper used in electric wires comes in two isotopes:  63 Cu and  65 Cu.  63 Cu has an abundance  of 69.09%. The other isotope,  65 Cu, has an abundance of 30.91%. Calculate the average  atomic mass of copper.   63 Cu   0.6909 x 63=       43.5267   65 Cu    0.3091 x 65=    +20.0915                                     63.6182 amu 10.Hydrogen has three common isotopes:  1 H (99%),  2 H (0.8%), and  3 H (0.2%). What is the  average atomic mass of hydrogen? 1 H   0.99 x 1=        0.99 2 H   0.008 x 2        0.016

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School: University of Texas at Dallas
Department: Chemistry
Course: General Chemistry I
Professor: John Sibert
Term: Fall 2018
Tags: General Chemistry
Name: Isotopes
Description: These are a short note on isotope
Uploaded: 12/29/2018
2 Pages 54 Views 43 Unlocks
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