Bromine has two naturally occurring isotopes (Br?79 and Br?81) and has an atomic mass of 79.904...
Bromine has two naturally occurring isotopes (Br?79 and Br?81) and has an atomic mass of 79.904 amu. The mass of Br?81 is 80.9163 amu, and its natural abundance is 49.31%.Calculate the mass of Br?79..
Br
Express your answer using four significant figures.
Calculate the natural abundance of Br?79.
Express your answer using four significant figures.
Homework Answers
The natural abundance would be 100% - 49.31% = 50.69%
79.904amu = (80.9163)(.4931) + (X)(.5069)
solve for X......mass of Br-79 = 78.922 amu
if Br-81 is 80.9163 amu , and its natural abundance is
49.31%
then
the natural abundance of Br-79 is the rest out of 100 =
50.69%
==============
Calculate the mass
0.5069 (X) + 0.4931(80.9163) = 79.904
0.5069 (X) + 39.8998 = 79.904
0.5069 (X) = 79.904 - 39.8998
0.5069 (X) = 40.0042
X = 78.919
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