Chapter 2, Problem 2.102P

The two isotopes of potassium with significant abundance in nature are ${\text{are }}^{\text{39}}\text{K }\left(\text{isotopic mass 38}\text{.9637 amu, 93}\text{.258\%}\right){\text{ and }}^{\text{41}}\text{K}\left(\text{isotopic mass 40}\text{.9618 amu, 6}\text{.730\%}\right).$ Fluorine has only one naur ally occurring isotope, ${}^{\text{19}}\text{F (isotopic mass 18}\text{.9984 amu)}\text{.}$ Calculate the formula mass of potassium fluoride.