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    Atomic Mass & Isotopic Abundance

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    The element boron consists of two isotopes, 10(superscript), 5(subscript)B and 11(superscript), 5(subscript)B. Their masses, based on the carbon scale, are 10.01 and 11.01, respectively. The abundance of 10(superscript), 5(subscript)B is 20.0%. What is the abundance of 11(superscript), 5(subscript)B?

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    https://brainmass.com/chemistry/general-chemistry/atomic-mass-isotopic-abundance-41169
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