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

question 119

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 amu 48.61%
Zn-66 65.9260 amu 27.9%
Zn-67 66.9271 amu 4.1%
Zn-68 67.9248 amu 18.75%
Zn-70 69.9253 amu 0.62%

• A)65.34 amu
• B)65.38 amu
• C)65.65 amu
• D)65.19 amu
• E)65.85 amu

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