Question
The element bromine is distributed betweentwo isotopes. The first, amounting to$50.69 \%,$ has a mass of 78.918 amu. Thesecond, amounting to 49.31$\%$ , has a mass of80.916 amounting to $49.31 \%,$ has a mass ofmass of bromine.
Step 1
This is done by dividing the percentage by 100. For the first isotope, we have $50.69 \% = 0.5069$ and for the second isotope, we have $49.31 \% = 0.4931$. Show more…
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Bromine has two naturally occurring isotopes, bromine- 79 (atomic mass $=78.9183 \mathrm{u} ; \quad$ abundance $=50.69 \%)$ a $\mathrm{nd}$ bromine-81 $\quad$ (atomic mass $=80.9163 \mathrm{u} ;$ abundance $=$ $49.31 \%) .$ Calculate the atomic weight of bromine.
The atomic weight of bromine is 79.904 . The natural abundance of ${ }^{81} \mathrm{Br}$, atomic weight $80.916289 \mathrm{u}$, is $49.31 \%$. What is the atomic weight of the only other natural isotope of bromine?
The atomic weight of bromine is $79.904$. The natural abundance of ${ }^{81} \mathrm{Br}$ is $49.31 \%$. What is the atomic weight of the only other natural isotope of bromine?
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