bromine has two isotopes Br,79 and Br-81
the relative atomic mass of bromine is 79.9
calculate the percentage or br 79 atoms in a sample of bromine
show all working out with all equations used and no abbreviations please
To calculate the percentage of Br-79 atoms in a sample of bromine, we need to use the relative atomic masses of both isotopes.
Given:
Relative atomic mass of bromine: 79.9
Isotope Br-79
Isotope Br-81
The first step is to determine the weighted average of the two isotopes. This can be calculated using the equation:
Relative atomic mass = (mass of isotope 1 x abundance of isotope 1) + (mass of isotope 2 x abundance of isotope 2)
Let's denote the abundance of Br-79 as x (in percentage, because we need to calculate the percentage).
79.9 = (79 x x) + (81 x (100 - x))
Now we can solve for x.
79.9 = 79x + 8100 - 81x
79.9 - 8100 = -2x
-8020.1 = -2x
x = -8020.1 / -2
x = 4010.05
The abundance of Br-79 is approximately 4010.05%.
Therefore, the percentage of Br-79 atoms in a sample of bromine is approximately 4010.05%.