Problem: Calculate the abundance of the two Bromine isotopes: 79 Br = 78.918336 g/mol and 81 Br = 80.91629 g/mol , given that the average mass of Bromine is 79.904 g/mol. Plan: Let the abundance of 79 Br = X and of 81 Br = Y and X + Y = 1.0 Solution: X(78.918336) + Y(80.91629) = 79.904 X + Y = 1.00 therefore
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