1. Calculate the molar mass of HBr:
* H (hydrogen) has a molar mass of 1.01 g/mol
* Br (bromine) has a molar mass of 79.90 g/mol
* Molar mass of HBr = 1.01 g/mol + 79.90 g/mol = 80.91 g/mol
2. Calculate the number of moles of HBr:
* moles = mass / molar mass
* moles = 2.13 g / 80.91 g/mol = 0.0263 mol
3. Calculate the number of molecules of HBr:
* One mole of any substance contains 6.022 x 10^23 molecules (Avogadro's number)
* molecules of HBr = 0.0263 mol * 6.022 x 10^23 molecules/mol = 1.58 x 10^22 molecules
4. Calculate the total number of atoms:
* Each HBr molecule contains 2 atoms (1 hydrogen and 1 bromine)
* Total atoms = 1.58 x 10^22 molecules * 2 atoms/molecule = 3.16 x 10^22 atoms
Therefore, there are approximately 3.16 x 10^22 atoms in 2.13 grams of HBr.
