What is the average atomic mass of lithium?

1 Answer
anor277
Jan 30, 2016

The major isotopes of lithium are (i) 7Li, and (ii) 6Li. The weighted average of these isotopes is 6.941 g⋅mol−1.

Explanation:

You will have to look up the isotopic distribution of lithium nuclei. ALL lithium nuclei have 3 positively charged nuclear particles, protons, i.e. Z = 3. These 3 particles give rise to the element's identity. If you take the weighted average of ALL lithium nuclei, we get an average mass of 6.941 g⋅mol−1.

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