Find the natural abundance pertance of Cu-65 ~ 64.928 and Cu-63 ~ 62.930 with a AMU of 63.540?



Answer:
63.540 (100)=(64.928(100-x))+(62.930(...
6354=6492.8-64.928x+62.930x
-138.8=-1.998x
69.47=x

Cu63 is 69.47% and Cu65 is 30.53%

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