Here's how to figure out the number of atoms in H₂SO₄ (sulfuric acid):

* Identify the elements: The formula tells us sulfuric acid is made of hydrogen (H), sulfur (S), and oxygen (O).

* Count the subscripts:

* There are 2 hydrogen atoms (H₂)

* There is 1 sulfur atom (S)

* There are 4 oxygen atoms (O₄)

* Total: 2 + 1 + 4 = 7 atoms

Therefore, there are 7 atoms in a molecule of H₂SO₄.