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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?

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

63.5474

Isotopes

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