The law of definite proportions states that different samples of a pure compound always contain the same elements in the same proportion by

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The law of definite proportions, also known as Proust's Law, states that a chemical compound always contains its component elements in fixed ratio by mass and does not depend on its source and method of preparation. This means that the proportion by mass of the elements in a compound is always the same, regardless of the amount or source of the compound.

The Law of Definite Proportions States That Different Samples of a Pure