H2+O2=?

The reaction between hydrogen gas (H₂) and oxygen gas (O₂) produces water (H₂O). The balanced chemical equation for this reaction is:

\[ 2H_2 + O_2 \rightarrow 2H_2O \]

This indicates that two molecules of hydrogen react with one molecule of oxygen to produce two molecules of water. This reaction is also highly exothermic, releasing energy in the form of heat and light.