The average atomic weight of copper,which has two naturally occurring isotopes,is 63.5.One of the isotopes has an atomic weight of 62.9 amu and constitutes 69.1% of the copper isotopes.The other isotope has an abundance of 30.9%.The atomic weight (amu)of the second isotope is ________ amu.
A)63.2
B)63.8
C)64.1
D)64.8
E)28.1

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The Answer of The average atomic weight of copper,which has two naturally occurring isotopes,is 63.5.One of the isotopes has an atomic weight of 62.9 amu and constitutes 69.1% of the copper isotopes.The other isotope has an abundance of 30.9%.The atomic weight (amu)of the second isotope is ________ amu.
A)63.2
B)63.8
C)64.1
D)64.8
E)28.1

The Average Atomic Weight of Copper,which Has Two Naturally Occurring