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If the natural abundance of Br−79 is 50.69 %, what is the natural abundance of Br−81?
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the average mass of both isotopes of Br is found on the periodic table, 79.9 amu. That weighted average is the sum of the contributions of both Br-79 and Br-81. Set up an equation that will use the percentages and isotopes to get the weighted average.\[\%^{79}Br *(79amu) + \%^{81}Br*(81amu) = 79.9amu\]all that's missing is the percent of Br-81
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