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

question 175

Multiple Choice

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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