define law of constant composition
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In chemistry, the law of definite proportion, sometimes called Proust's law or the law of definite composition, or 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.
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The law of constant composition states that when elements are chemically combined, they are always present in certain proportions by weight. This is known as the law of constant composition
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