The average atomic mass of naturally occurring lithium is, Ask an Expert

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The average atomic mass of naturally occurring lithium is 6.941 amu. its is mixture of two isotopes : lithium 6 (isotopic mass = 6.01512amu) and lithium 7( isotopic mass = 7.01600). what is the percent composition of lithium? (hint, if x = the % of lithium 6, what is the %of lithium 7 )

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