The formula of sulfuric acid is H₂SO₄; What is the relative formula mass, Mₗ, of sulfuric acid? The relative atomic mass, Aₗ, of H is 1, of S is 32 and of O is 16. - OCR Gateway - GCSE Chemistry - Question 5 - 2019 - Paper 1

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

• 2 Hydrogen (H) atoms:

  • 2 × 1 = 2

• 1 Sulfur (S) atom:

  • 1 × 32 = 32

• 4 Oxygen (O) atoms:

  • 4 × 16 = 64

Now, we'll add these together:

$Mₗ = (2) + (32) + (64) = 98$

Thus, the relative formula mass of sulfuric acid is 98.