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    danibey Posts: 2, Reputation: 1
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    Apr 22, 2012, 12:19 PM
    ask chemistry questions
    1) Copper is made up of two isotopes, Cu-63 and Cu-65. Given copper's atomic weight of 63.546 what is the percent abundance of each isotope?




    2) Calculate the number of ions present in .25 moles of NaCl(aq)




    3) Determine the mass of 1.20 X 10 to the 23 molecules of N2O5

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