The isotope lithium-7 has a mass of 70160 atomic mass units, Ask an Expert

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The isotope lithium-7 has a mass of 7.0160 atomic mass units, andthe isotope lithium-6 has a mass of 6.0151 atomic mass units. Given that 92.58 percent of all lithium atoms found in nature arelithium-7, and 7.42 percent are lithium-6, calculate the average atomic mass of lithium.

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