The law of constant composition states: All samples of a given compound have the same proportions of their constituent elements.

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The law of constant composition, also known as the law of definite proportions, is a fundamental principle of chemistry that states that all samples of a given compound have the same proportions of their constituent elements, regardless of their origin or preparation. This means that the ratio of the masses of different elements in a compound is always the same, and that the identity of a compound is determined by its chemical formula.

The Law of Constant Composition States: All Samples of a Given