* Water's Formula: The chemical formula for water is H₂O, meaning each molecule contains 2 hydrogen atoms (H) and 1 oxygen atom (O).

* Two Molecules: Since we have 2 molecules of water, we multiply the number of hydrogen atoms per molecule by 2.

Calculation: 2 molecules * 2 hydrogen atoms/molecule = 4 hydrogen atoms

Therefore, there are 4 hydrogen atoms in 2 molecules of water.