anonymous
  • anonymous
Naturally occurring copper exists in two isotopic forms. 63Cu and 65Cu. The atomic mass of copper is 63.55 amu. What is the approximate natural abundance of 63Cu?
Chemistry
  • Stacey Warren - Expert brainly.com
Hey! We 've verified this expert answer for you, click below to unlock the details :)
SOLVED
At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.
chestercat
  • chestercat
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
aaronq
  • aaronq
It's a weighted average. Atomic mass = (abundance of 63Cu* mass of 63Cu)+ (abundance of 65Cu* mass of 65Cu)
anonymous
  • anonymous
But how do you find the abundance? All I was given was in the question.
anonymous
  • anonymous
Use algebra. \[63x+65y=63.55\] \[x+y=1\] It would be 1 and not 100 because natural abundance is in percentage. 80% would be 0.80 and 70% would be 0.70 Natural abundance of both isotopes would need to be at 100% since those are the only isotopes for copper. 100%=1

Looking for something else?

Not the answer you are looking for? Search for more explanations.

More answers

anonymous
  • anonymous
There is another method but I forgot.
anonymous
  • anonymous
Alright. Thanks.
anonymous
  • anonymous
No problem! But what did you get for each?
anonymous
  • anonymous
I got 63 Cu = 62.925989 and 65 Cu = 64.9277929
anonymous
  • anonymous
Then I did all the math and got x=.689
anonymous
  • anonymous
Sorry about the late replies.
anonymous
  • anonymous
63Cu = 68.95% 65 Cu = 31.05%
anonymous
  • anonymous
You did the math wrong. 63(0.6895)+65(0.3105) did not equal 63.55. It equaled 63.62 so your answer is a bit close to the real one. You can check your answers this way.
anonymous
  • anonymous
I'll have to go back and see what I did wrong. I guess my professor is wrong too. lol I got the same answer as them. Probably should let them know.
anonymous
  • anonymous
They are wrong because my answers matches to 63.55 amu.
anonymous
  • anonymous
I'll let them know. Thanks for checking the math for me.
anonymous
  • anonymous
I'm bad about making little mistakes in the math. It can really throw it off.
anonymous
  • anonymous
No problem!

Looking for something else?

Not the answer you are looking for? Search for more explanations.