Question

There are 2 naturally occurring isotopes of bromine. Br-79 is 51% and Br-81 is 49% of the Bromine composition in nature. Calculate the approximate average atomic mass of bromine using this data Round your answer to the hundredths place and include only the value and units in your answer.

Answer 1

The average atomic mass of bromine is approximately 79.94 amu.

Step-by-step explanation:

The average atomic mass of bromine can be calculated using the mass and abundance of its isotopes. In this case, we have two isotopes of bromine: Br-79 and Br-81. The mass of Br-79 is 78.9183 amu, and its abundance is 51%. The mass of Br-81 is 80.9163 amu, and its abundance is 49%. To calculate the average atomic mass, we multiply the mass of each isotope by its abundance and add the results:

Average atomic mass = (mass of Br-79 * abundance of Br-79) + (mass of Br-81 * abundance of Br-81)

= (78.9183 amu * 0.51) + (80.9163 amu * 0.49)

= 40.248333 amu + 39.690347 amu

= 79.94 amu