The average atomic mass of copper is 63.55 amu. If the only two isotopes of copper have masses of 62.94 amu and 64.93 amu, what are the percentages of each?

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Chapter5: Atomic Theory : The Nuclear Model Of The Atom
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The average atomic mass of copper is 63.55 amu. If the only two isotopes of copper
have masses of 62.94 amu and 64.93 amu, what are the percentages of each?
(Think algebra) 

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