Chapter 2, Problem 78IAE

Germanium has three major naturally occurring isotopes: ${}^{\text{70}}\text{Ge }\left(\text{69}\text{.92425 u, 20}\text{.85\%}\right){\text{,}}^{\text{72}}\text{Ge }\left(\text{71}\text{.92208 u, 27}\text{.54\%}\right){\text{,}}^{\text{74}}\text{Ge }\left(\text{73}\text{.92118 u, 36}\text{.29\%}\right)$ .There are also two minor isotopes: ${}^{\text{72}}\text{Ge }\left(\text{72}\text{.92346 u}\right){\text{ and}}^{\text{74}}\text{Ge }\left(\text{75}\text{.92140 u}\right)$ . Calculate the percent isotopic abundances of the two minor isotopes. Comment on the precision of these calculations.