# Isotope Abundance

Question:

The nuclear power industry extracts $$^6$$Li but not $$^7$$Li from natural samples of lithium. As a result, the average molar mass of commercial samples of lithium is increased. The current abundace of the two isotopes are 7.42% and 95.58% respectively, and the masses of their atoms are 9.968 x 10$$^{-24}$$ g and 1.165 x 10$$^{-23}$$ g. What is the current molar mass of a natural sample of lithium?

Subject: