Joseph Louis Gay-Lussac

What is the Gay-Lussac's Law of Combining VOlumes?

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The law of combining volumes states that, when gases react together to form other gases, and all volumes are measured at the same temperature and pressure:

The ratio between the volumes of the reactant gases and the products can be expressed in simple whole numbers.

This reflects the fact that (Avogardo's law) equal volumes of gas contain equal numbers of molecules (at the same temperature and pressure), and also that in chemical reactions, the molecules combine in a ratio of whole numbers—this is known as the stoichiometry of the chemical reaction and is expressed via the chemical equation for the reaction.

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