Calculate the molar mass of each of the following compounds: (a) hydrogen fluoride, HF (b) ammonia, NH3 (c) nitric acid, HNO3 (d) silver sulfate, Ag2SO4 (e) boric acid, B(OH)3 Chapter 2.16 16. Determine the number of protons, neutrons, and electrons in the following isotopes that are used in medical diagnoses: (a) atomic number 9, mass number 18, charge of 1- (b) atomic number 43, mass number 99, charge of 7+ (c) atomic number 53, atomic mass number 131, charge of 1- (d) atomic number 81, atomic mass number 201, charge of 1+ (e) Name the elements in parts (a), (b), (c), and (d).