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The law of definite proportions states that a given chemical compound always contains the same elements in the exact same proportions by mass.
In chemistry, the law of definite proportions, sometimes called Proust's law or the law of constant composition, states that a given chemical compound always contains its component elements in fixed ratio (by mass) and does not depend on its source and method of preparation.
Law of definite proportions, statement that every chemical compound contains fixed and constant proportions (by mass) of its constituent elements. French chemist Joseph-Louis Proust first accumulated conclusive evidence for it in a series of researches on the composition of many substances.
The law of definite proportions states that a chemically pure substance always contains the same set of elements combined together in a definite proportion by weight. In other words, the law can be stated as the percentage composition of an element in a compound is always fixed.
The definition of the law of definite proportions is that in any chemical compound, the mass ratio of its elements is constant. The law of definite proportions is also...
The law of definite proportions states that any samples of a single compound contain the same proportion of elements by mass. Other names for the law are Proust’s law or the law of constant composition .
The law of definite proportions, together with the law of multiple proportions, forms the basis for the study of stoichiometry in chemistry. The law of definite proportions is also known as Proust's law or the law of constant composition.