Respuesta :

According to the law of definite composition, a specific compound is made up of the same elements in the same mass fractions regardless of the sources. It therefore only applies to compounds.

According to the law of definite composition, a chemical compound's constituent elements are present in fixed and predictable amounts (by mass). Any sample of pure water contains roughly 8/9 of the mass of oxygen and 1/9 of the amount of hydrogen. The study of stoichiometry in chemistry is based on this law of fixed ratio.

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