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
jamb 2016chemistry

The correct answer is D. 6.9

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

= 6.3 + 0.6 = 6.9

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