Answer:
2 molecules of water
Step-by-step explanation:
In chemical reactions, molecules and compounds chemically combine to give products. This involves atoms combining by re-establishing bonding relationships.
4 hydrogen atoms is equivalent to 2 molecules of Hydrogen gas = H₂
2 oxygen atoms is the same as 1 oxygen molecule = O₂
This 2 molecules of hydrogen gas and 1 molecule of O₂ gas will combine to form 2 molecules of water chemically;
2H₂ + O₂ → 2H₂O