To calculate the molar mass of Br2, we first need to know the atomic mass of a single bromine (Br) atom. The atomic mass of bromine is approximately 79.904 g/mol.
Since Br2 consists of two bromine atoms, we simply multiply the atomic mass of bromine by 2:
79.904 g/mol × 2 = 159.808 g/mol.
Therefore, the molar mass of Br2 is approximately 159.808 g/mol.