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Q.

Two stable isotopes of lithium 36Li and 37Li have respective abundances of 7.5% and 92.5%. These isotopes have masses 6.01512u and 7.01600u,respectively. Then the atomic mass of lithium is

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a

6.491 u

b

5.941 u

c

6.941 u

d

6.149 u

answer is C.

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Detailed Solution

Mav=7.5×6.01512+92.5×7.01600100=45.1134+648.98100=694.0934100Mav=6.941u

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