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The relative atomic mass of a naturally occurring lithium consisting of 90% \(^7_3\)Li and 10% \(^6_3\)Li is...


Question

The relative atomic mass of a naturally occurring lithium consisting of 90% \(^7_3\)Li and 10% \(^6_3\)Li is

Options

A) 6.9

B) 7.1

C) 6.2

D) 6.8


The correct answer is A.

Explanation:

R.A.M = \(\mathrm{m_1\alpha_1} + \mathrm{m_2\alpha_2}\)

= 7(90/100) + 6(10/100)

= 6.3 + 0.6

= 6.9


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