Copper has 2 stable isotopes, namely Cu-63 and Cu-65. The atomic masses of the said isotopes are 62.930 u and 64.928 u, respectively. If Cu-63 comprises 69.17% of all the naturally-occurring copper and the rest is Cu-65, what is the standard atomic weight of copper?

Chemistry & Chemical Reactivity
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Chapter2: Atoms Molecules And Ions
Section: Chapter Questions
Problem 24PS: Europium has two stable isotopes, 151Eu and 153Eu, with masses of 150.9197 u and 152.9212 u,...
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Copper has 2 stable isotopes, namely Cu-63 and Cu-65. The atomic masses of the said isotopes are 62.930 u and 64.928 u, respectively. If Cu-63 comprises 69.17% of all the naturally-occurring copper and the rest is Cu-65, what is the standard atomic weight of copper? 

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