Chlorine (atomic number 17) is composed of two principal isotopes, chlorine-35, which has a mass of 34.9689 atomic mass units, and chlorine-37, which has a mass of 36.9659 atomic mass units. Assume that 75.77% of all chlorine atoms are the chlorine-35 isotope and 24.23%

are the chlorine-37 isotope. Show that the atomic mass of natural chlorine is 35.45 amu.