 Custom Search Law of Definite ProportionLaw of Definite Proportion Also known as Proust Law or the principle of constant composition, the law of definite proportions states that, "a given compound always contains exactly the same proportion of elements by mass." In other words, a pure compound, the elements combine in definite proportions to each other. Ex. IN water H2O the ratio proportion of hydrogen to oxygen is always 1:8. That is 2 grams of hydrogen to every 16 grams of oxygen.
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