The law of definite proportions states that a compound or mixture is always composed of the same relative masses of its elements.

Name: The law of definite proportions states that a compound or mixture is always composed of the same relative masses of its elements.
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The law of definite proportions applies to compounds, stating that a given compound is always composed of the same elements in the same proportion by mass, but it does not apply to mixtures, where the composition can vary.

The Law of Definite Proportions States That a Compound or Mixture