Question

Based on the chemical equation provided, use the drop-down menu to choose the coefficients that will balance the chemical equation. ( )H2 ( )O2 → ( )H2O

Answer 1

On the left side, you have 2 atoms of oxygen, so you need at least 2 molecules of water on the right. Then you would end up with 4 total atoms of hydrogen on the right, so you need to have 2 hydrogen molecules on the left to balance the reaction:

2 H₂ + O₂   ⇄   2 H₂O