The relative atomic mass of a naturally occurring lithium consisting of 90%\(\frac{7}{3}\)Li and 10%\(\frac{6}{3}\)Li is

A.

6.2

B.

6.8

C.

7.1

D.

6.9

View answer & explanation

Correct answer is D

(\(\frac{90}{100}\) x 7) + (\(\frac{10}{100}\) x 6)

= 6.3 + 0.6 = 6.9

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