2Н2+O2=?

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

\[ 2 \text{H}_2 + \text{O}_2 \rightarrow 2 \text{H}_2\text{O} \]

This means that two molecules of hydrogen react with one molecule of oxygen to form two molecules of water.