A. 6.2
B. 6.8
C. 7.1
D. 6.9
Correct Answer:
Option D = 6.9
Explanation
(90/100 x 7) + (10/100 x 6)
= 6.3 + 0.6 = 6.9
The relative atomic mass of a naturally occurring lithium consisting of 90% 7/3 Li and 10% 6/3 Li is?
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