1. Determine the molar mass of MgCl2:
- Molar mass of Mg = 24.305 g/mol
- Molar mass of Cl = 35.453 g/mol
- Molar mass of MgCl2 = (1 x 24.305 g/mol) + (2 x 35.453 g/mol) = 95.211 g/mol
2. Calculate the mass of 4 moles of MgCl2:
- Mass = Number of moles × Molar mass
- Mass of 4 moles of MgCl2 = 4 moles × 95.211 g/mol = 380.844 g
3. Convert the mass of MgCl2 to moles of atoms:
- For Mg: 1 mole of MgCl2 contains 1 mole of Mg atoms.
- For Cl: 1 mole of MgCl2 contains 2 moles of Cl atoms.
- Therefore, 4 moles of MgCl2 contain:
- 4 moles of Mg atoms
- 8 moles of Cl atoms
4. Calculate the total number of atoms:
- Total number of atoms = Number of Mg atoms + Number of Cl atoms
- Total number of atoms = 4 moles + 8 moles = 12 moles of atoms
Therefore, there are 12 moles of atoms in 4 moles of MgCl2.
