The molecular mass of hydrogen bromide (HBr) is the sum of the atomic masses of its constituent atoms: hydrogen (H) and bromine (Br). H has an atomic mass of approximately 1 atomic mass unit (amu) and Br has an atomic mass of approximately 80 amu. Therefore, the molecular mass of HBr is approximately 81 amu. This value represents the mass of one molecule of HBr and is essential for understanding the stoichiometry of chemical reactions involving HBr.
