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What is the relative atomic mass of naturally occuring copper to four decimal places when you are given 69,09% of copper-63 with a relative atomic mass of 62,9298 with 30,91% of copper-65, with a relative atomic mass of 64,9278?

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I need your help guyz plz!

0.6906(mass) + 0.3091(mass) = avg mass.

Help guys

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