Ask Question
7 February, 03:04

5. The element copper has naturally occurring isotopes with mass numbers of 63

and 65. The relative abundance and atomic masses are 69.2% and 30.8%

respectively. Calculate the average atomic mass of copper.

+5
Answers (1)
  1. 7 February, 05:23
    0
    Average atomic mass = 63.62 amu.

    Explanation:

    Abundance of Co⁶³ = 69.2%

    Abundance of Co⁶⁵ = 30.8%

    Atomic mass of Co⁶³ = 63 amu

    Atomic mass of Co⁶⁵ = 65 amu

    Average atomic mass = ?

    Solution:

    Average atomic mass = (abundance of 1st isotope * its atomic mass) + (abundance of 2nd isotope * its atomic mass) / 100

    Average atomic mass = (63*69.2) + (65*30.8) / 100

    Average atomic mass = 4359.6 + 2002 / 100

    Average atomic mass = 6361.6 / 100

    Average atomic mass = 63.62 amu.
Know the Answer?
Not Sure About the Answer?
Find an answer to your question ✅ “5. The element copper has naturally occurring isotopes with mass numbers of 63 and 65. The relative abundance and atomic masses are 69.2% ...” in 📘 Chemistry if you're in doubt about the correctness of the answers or there's no answer, then try to use the smart search and find answers to the similar questions.
Search for Other Answers