Introduced by,joseph proust
Law of definite proportions
Inchemistry, thelaw of definite proportions, sometimes calledProust's LaworThe Law of Definite Composition, states that achemical compoundalways contains exactly the same proportion ofelementsby mass. An equivalent statement is thelawof constant composition, which states that all samples of a given chemical compound have the same elemental composition by mass. For example,oxygenmakesup about8/9of the mass of any sample of purewater, whilehydrogenmakes up the remaining1/9of the mass. Along with thelaw of multiple proportions, the law of definite proportions forms the basis ofstoichiometry.
History
This observation was first made by theFrenchchemistJoseph Proust, based on several experiments conducted between 1798 and 1804.[2]Based on such observations, Proust made statements like this one, in 1806:
Law of definite proportions
Inchemistry, thelaw of definite proportions, sometimes calledProust's LaworThe Law of Definite Composition, states that achemical compoundalways contains exactly the same proportion ofelementsby mass. An equivalent statement is thelawof constant composition, which states that all samples of a given chemical compound have the same elemental composition by mass. For example,oxygenmakesup about8/9of the mass of any sample of purewater, whilehydrogenmakes up the remaining1/9of the mass. Along with thelaw of multiple proportions, the law of definite proportions forms the basis ofstoichiometry.
History
This observation was first made by theFrenchchemistJoseph Proust, based on several experiments conducted between 1798 and 1804.[2]Based on such observations, Proust made statements like this one, in 1806:
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