When 2 Volumes of dihydrogen react with 1 volume of oxygen, 2 volumes of water is produced:
Therefore, when 10 volumes of dihydrogen react with 5 volumes of oxygen, 10 volumes of water is produced. This observation is associated with the Gay Lussac’s law of gaseous volumes. According to this law, the ratio between the volumes of the reactant gases and the products can be expressed in simple whole numbers.
