Naturally occurring lithium consists of 90% \( ^7_3Li \te...
Naturally occurring lithium consists of 90% 73Li and 10% 63Li. What is the relative atomic mass of lithium?
6
6.8
6.9
7
7.1
Correct answer is C
the relative atomic mass of lithium = percentage abundance times the mass number of the first isotope + percentage abundance times the mass number of the second isotope.
the relative atomic mass of lithium = ( 90100×7+10100×6) =(( 0.9 x 7) + (0.1 x 6)) = 6.3 + 0.6 = 6.9.
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