Question

lithium has average atomic mass of 6.941 u and has 2 naturally occuring isotopes, 6 Li and 7 Li respectively. What are the natural abundances of the isotopes of lithium​

Answer 1

Answer:

The quoted atomic mass is the weighted average of the individual isotopic masses of 7Li and 6Li . mass of 6Li isotope=0.446⋅amu0.0742=6.011⋅amu .