Zinc Has Five Naturally Occurring Isotopes, Zn-64, Zn-66, Zn-67, Zn-68

question 159

Multiple Choice

Zinc has five naturally occurring isotopes, Zn-64, Zn-66, Zn-67, Zn-68 and Zn-70. Calculate the atomic mass of zinc given the following abundances and atomic masses for the isotopes:
Zn-64 63.9291 u 48.61%
Zn-66 65.9260 u 27.9%
Zn-67 66.9271 u 4.1%
Zn-68 67.9248 u 18.75%
Zn-70 69.9253 u 0.62%

• A) 66.3 u
• B) 65.4 u
• C) 66.7 u
• D) 65.1 u
• E) 64.8 u

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