Naturally occurring Bromine has a relative atomic mass of 80 and consists entirely of two isotopes of relative atomic masses 79 amd 81.
What can be deduced about naturally occurring Bromine from this information only?
A Bromine contains the two isotopes in equal proportions
B Bromine has different oxidation states
C Bromine isotopes have different number of protons
D Bromine is radioactive
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Answers
Answer:
The statement means that relative atomic mass that is the ratio of the mass of one atom bromine to one twelfth of the mass of carbon atom is given is g m o l e . This conversation is already closed by Expert.
Explanation:
Answer:
mass(amu)
X
Isotopic abundance
Br-79
X
X
X
X
78.92
X
X
X
X
X
X
X
?
Br-81
X
X
X
X
80.92
X
X
X
X
X
X
X
?
average atomic mass
=
(
mass*%
+
mass*%
+
mass*%
...
)
Let x be % abundance of Br-79
Let 1-x be % abundance of Br-81
Br is 79. 904g/mol on the periodic table
(average atomic mass)
79.904
%
=
x
+
(
1
−
x
)
79.904
%
=
(
78.92
⋅
x
)
+
(
80.92
⋅
(
1
−
x
)
)
79.904
%
=
(
78.92
x
)
+
(
80.92
−
80.92
x
)
)
79.904
%
=
78.92
x
+
80.92
−
80.92
x
79.904
%
=
−
2
x
+
80.92
79.904
%
−
80.92
=
78.92
x
−
1.016
=
−
2
x
x
=
0.508
Use our x to find that % abundance of Br-79
x
⋅
100
%
0.508
⋅
100
%
=
50.8
%
a
b
u
n
d
a
n
c
e
Use our x to find that % abundance of Br-79
(
1
−
x
)
⋅
100
%
0.492
⋅
100
%
=
49.2
%
a
b
u
n
d
a
n
c
e
∴
The % abundance of the isotope with a mass of 78.92 amu has a % abundance of 50.8% and the isotope with a mass 80.92 amu has a % abundance of 49.2%