The observations that gaseous reactants combine to form gaseous products in volume ratios that are simple whole numbers is most directly summarized by which of the following.

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The observation that gaseous reactants combine to form gaseous products in volume ratios that are simple whole numbers is summarized by the Law of Combining Volumes. This law states that the volumes of gases involved in a chemical reaction at a constant temperature and pressure are in a ratio of small whole numbers.

The Observations That Gaseous Reactants Combine to Form Gaseous Products