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Question from: Chemistry

The relative atomic mass of naturally occurring lithium consisting of 90% 7Li and 10% 6Li is

A)  

6.2

B)  

6.9

C)  

6.8

D)  

7.1

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j

juanbacan

hace 18 días

Solution

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Step-by-step calculation:

  • Given isotopes: \(\ce{^7Li}\) (90%) and \(\ce{^6Li}\) (10%).
  • Relative atomic mass (Ar) is the weighted average:

\[ A_r = \frac{(90 \times 7) + (10 \times 6)}{100} \]

\[ A_r = \frac{630 + 60}{100} = \frac{690}{100} = 6.9 \]

Final Answer: 6.9

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