The law of definite proportions states that a chemical compound always contains the same proportion of elements by mass.

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The law of definite proportions, also known as the law of constant composition, is a fundamental principle of chemistry stating that a given compound always contains the same proportion of elements by mass. This means that regardless of the source or method of preparation, the composition of a pure compound is fixed and can be expressed as a unique chemical formula.

The Law of Definite Proportions States That a Chemical Compound