Calculate the percent composition (by mass) of the element sulfur in aluminum sulfate, Al2(SO4)3. Hint: Please round your answers to the nearest whole number when you enter them. You answers will need a % sign, but you only enter the numeric portion in Canvas.

To calculate the percent composition of sulfur in aluminum sulfate, Al2(SO4)3, we need to determine the molar mass of sulfur and the molar mass of the entire compound.

Step 1: Calculate the molar mass of sulfur (S) The atomic mass of sulfur (S) is approximately 32.07 g/mol.

Step 2: Calculate the molar mass of aluminum sulfate (Al2(SO4)3) The molar mass of aluminum (Al) is approximately 26.98 g/mol. The molar mass of sulfur (S) is approximately 32.07 g/mol. The molar mass of oxygen (O) is approximately 16.00 g/mol.

So, the molar mass of aluminum sulfate (Al2(SO4)3) can be calculated as follows: Molar mass = (2 * molar mass of Al) + (3 * molar mass of S) + (12 * molar mass of O) Molar mass = (2 * 26.98 g/mol) + (3 * 32.07 g/mol) + (12 * 16.00 g/mol) Molar mass = 54.96 g/mol + 96.21 g/mol + 192.00 g/mol Molar mass = 343.17 g/mol

Step 3: Calculate the percent composition of sulfur in aluminum sulfate To calculate the percent composition, we need to divide the molar mass of sulfur by the molar mass of aluminum sulfate and multiply by 100.

Percent composition of sulfur = (molar mass of S / molar mass of Al2(SO4)3) * 100 Percent composition of sulfur = (32.07 g/mol / 343.17 g/mol) * 100 Percent composition of sulfur = 0.0935 * 100 Percent composition of sulfur = 9.35%

Therefore, the percent composition (by mass) of sulfur in aluminum sulfate, Al2(SO4)3, is approximately 9.35%.