What is the relative formula mass of sulfuric acid, H₂SO₄? The relative atomic mass, A₄, of H is 1.0, of S is 32.1 and of O is 16.0. - OCR Gateway - GCSE Chemistry Combined Science - Question 4 - 2019 - Paper 3

To calculate the relative formula mass of sulfuric acid (H₂SO₄), we need to sum the relative atomic masses of all the atoms in the formula:

• Hydrogen: There are 2 hydrogen atoms, so the total mass from hydrogen is:

  $2 \times 1.0 = 2.0$

• Sulfur: There is 1 sulfur atom, so the total mass from sulfur is:

  $1 \times 32.1 = 32.1$

• Oxygen: There are 4 oxygen atoms, so the total mass from oxygen is:

  $4 \times 16.0 = 64.0$

Now, summing these values together gives us:

$2.0 + 32.1 + 64.0 = 98.1$