and 
have
respective abundance of 7.5% and 92.5%. These isotopes have masses 6-01512 u
and 7-01600 u respectively.
Find the
atomic weight of lithium.
(b)
Boron has two stable isotopes 
and
. Their
respective masses are 10-01294 u and 11-00931 u and the atomic weight of boron
is 10-811 u. Find the abundances of and 
.
Answer:
(a) Atomic weight of lithium
(b) Let x%
and y% be the abundances of
and 
respectively.
?(i)
Also, Atomic
weight
i.e. 
i.e. 
?(ii)
Using
equation (i), we get
Then x = 100 -
80-09 = 19-91%.
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