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Calculate the atomic mass for zinc given the following data for its natural isotopes: 64Zn 63.929 amu 48.89 % 66Zn 65.926 amu 27.81 % 67Zn 66.927 amu 4.11 % 68Zn 67.925 amu 18.57 % 70Zn 69.925 amu 0.62
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Calculate the atomic mass for zinc given the following data for its natural isotopes:

64Zn 63.929 amu 48.89 %
66Zn 65.926 amu 27.81 %
67Zn 66.927 amu 4.11 %
68Zn 67.925 amu 18.57 %
70Zn 69.925 amu 0.62 %

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I'm confused on the question.. Could you explain it for me? and I'll answer this for you!
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