1. Determine the Molecular Formula:
* Aluminum sulfate is Al₂(SO₄)₃
2. Calculate the Molar Mass:
* Aluminum (Al): 2 atoms * 26.98 g/mol = 53.96 g/mol
* Sulfur (S): 3 atoms * 32.06 g/mol = 96.18 g/mol
* Oxygen (O): 12 atoms * 16.00 g/mol = 192.00 g/mol
* Total molar mass: 53.96 g/mol + 96.18 g/mol + 192.00 g/mol = 342.14 g/mol
3. Calculate the Mass:
* Mass = moles * molar mass
* Mass = 0.25 mol * 342.14 g/mol = 85.54 g
Therefore, the mass of 0.25 moles of aluminum sulfate is 85.54 grams.
