* Before the reaction: You have two oxygen atoms (O) and four hydrogen atoms (H).
* The reaction: The hydrogen and oxygen atoms combine to form water molecules (H₂O).
* After the reaction: You will have two molecules of water (2H₂O).
Here's the breakdown:
* Each water molecule (H₂O) requires two hydrogen atoms and one oxygen atom.
* You have enough hydrogen to form two water molecules (4H / 2H per molecule = 2 molecules).
* You have enough oxygen to form two water molecules (2O / 1O per molecule = 2 molecules).
Therefore, after the reaction, you will have two molecules of water (2H₂O) with no leftover atoms.
