Problem: Naturally occurring bromine consists of two isotopes, 79Br and 81Br with isotopic masses of 78.9183 and 80.9163, respectively. Given that the observed atomic mass of bromine is 79.904, calculate the percent abundance of 79Br and 81Br in naturally occurring bromine. 

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Naturally occurring bromine consists of two isotopes, 79Br and 81Br with isotopic masses of 78.9183 and 80.9163, respectively. Given that the observed atomic mass of bromine is 79.904, calculate the percent abundance of 79Br and 81Br in naturally occurring bromine. 

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