Naturally occurring bromine is composed of two isotopes: 50.69 % Br-79 (mass of 78.9183 amu) and 49.31 % Br-81(mass of 80.9163 amu). Naturally occurring oxygen is composed of three isotopes: 99.757% O-16 (mass of 15.9949 amu), 0.038% O-17 (mass of 16.9991 amu), and 0.205% O-18 (mass of 17.9991 amu). The compound dibromonoxide is composed of two bromine atoms and one oxygen atom bonded together to form the Br2O molecule. a) How many Br2O molecules of different masses naturally exist.
b) Give the masses of the three most abundant Br2O.