Law of Conservation of Mass in a chemical reaction: CH₄ + 2O₂ → CO₂ + 2H₂O, with masses totaling 80 g on reactant and product sides.
Diagram illustrating the Law of Conservation of Mass in the combustion of methane (CH₄) with oxygen (O₂) to produce carbon dioxide (CO₂) and water (H₂O), showing mass balance of 80 g on both sides.