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?

For the answer to the question above asking, What is the average atomic mass of copper if copper contains a mixture of 69.09% copper-63 (63.9298 amu) and 30.91% copper-65 (64.9278 amu)?

The average's about 63.62.

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m=9

step-by-step explanation:

7m+8=71 subtract   8 from 71 which is 63 than divide it by 7m   equal 9.

                             

Yes she is correct. the answer is completely correct