1. Calculate the molar mass of BeCl₂:
* Be (Beryllium) has a molar mass of 9.01 g/mol
* Cl (Chlorine) has a molar mass of 35.45 g/mol
* Molar mass of BeCl₂ = 9.01 g/mol + (2 * 35.45 g/mol) = 79.91 g/mol
2. Calculate the number of moles of BeCl₂:
* Moles = Mass / Molar Mass
* Moles = 2 g / 79.91 g/mol = 0.025 mol
3. Calculate the number of molecules of BeCl₂:
* One mole of any substance contains 6.022 x 10²³ particles (Avogadro's number)
* Number of BeCl₂ molecules = 0.025 mol * 6.022 x 10²³ molecules/mol = 1.5055 x 10²² molecules
4. Calculate the total number of atoms:
* Each BeCl₂ molecule contains 3 atoms (1 Be + 2 Cl)
* Total number of atoms = 1.5055 x 10²² molecules * 3 atoms/molecule = 4.5165 x 10²² atoms
Therefore, 2 grams of BeCl₂ contains approximately 4.5165 x 10²² atoms.
