4. (10 points) Copper consists primarily of two isotopes, Copper-63 and Copper-65.The weighted average isotopic mass for copper is 63.55 amu. Find the percentabundance of each of the two isotopes of copper.

Answered: (10 points) Copper consists primarily…

Chemistry

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Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

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4. (10 points) Copper consists primarily of two isotopes, Copper-63 and Copper-65.
The weighted average isotopic mass for copper is 63.55 amu. Find the percent
abundance of each of the two isotopes of copper.

Expert Solution

Step 1

The formula used to calculate the weighted average isotopic mass is written below:

$W e i g h t e d a v e r a g e i s o t o p i c m a s s = F r a c t i o n a l a b u n d a n c e \times a t o m i c m a s s o f i s o t o p e 1 + F r a c t i o n a l a b u n d a n c e \times a t o m i c m a s s o f i s o t o p e 2$

Let the fractional abundance of Copper-63 = z

and the fractional abundance of Copper-65 = 1-z

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(10 points) Copper consists primarily of two isotopes, Copper-63 and Copper-65. The weighted average isotopic mass for copper is 63.55 amu. Find the percent abundance of each of the two isotopes of copper.