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Byju's Answer
Standard IX
Chemistry
Atomic Mass and Atomic Mass Unit
Bromine occur...
Question
Bromine occurs in nature mainly in the form of two isotopes
Br
35
79
and
Br
35
81
. If the abundance of
Br
35
79
is isotope is 49.7% and that of
Br
35
81
isotope is 50.3% calculate the average atomic mass of bromine.
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Solution
Isotope
of
bromine
with
atomic
mass
79
is
49
.
7
%
.
So
,
it
'
s
contribution
to
the
atomic
mass
of
bromine
=
79
×
49
.
7
100
=
39
.
263
u
Isotope
of
bromine
with
atomic
mass
81
is
50
.
3
%
.
So
,
it
'
s
contribution
to
the
atomic
mass
of
bromine
=
81
×
50
.
3
100
=
40
.
743
u
Average
atomic
mass
of
Bromine
=
39
.
263
+
40
.
743
=
80
.
006
u
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