Question

Naturally occurring copper contains a mixture of 69.09% copper-63 (63.9298 amu) and 30.91% copper-65 (64.9278 amu). What is the average atomic mass of copper?

Answer 1

0.6909*63.9298 + 0.3091*64.9278 = X
<b>Note: Check your post. I think the 63.9298 should be 62.9298.</b>

Answer 2

63.5474

Answer 3

Isotopes