1. Find the molar mass of H₂SO₄:

* H: 1.01 g/mol (x 2 = 2.02 g/mol)

* S: 32.07 g/mol

* O: 16.00 g/mol (x 4 = 64.00 g/mol)

* Total molar mass of H₂SO₄: 2.02 + 32.07 + 64.00 = 98.09 g/mol

2. Calculate the mass percentage of sulfur:

* (Mass of sulfur / Molar mass of H₂SO₄) x 100%

* (32.07 g/mol / 98.09 g/mol) x 100%

* ≈ 32.7%

Therefore, the percent composition of sulfur in H₂SO₄ is approximately 32.7%.