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This follows from the law of constant proportions which was discovered by the French chemist Joseph Proust. His law states that a chemical compound always contains the same elements combined together in the same proportion by mass.

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βˆ™ 8y ago
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βˆ™ 10y ago

Because that's the definition of a compound. Two substances are considered distinct if they have distinct compositions.

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βˆ™ 8y ago

Today this affirmation is only partially valid; many nonstoichiometric compounds are known.

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Q: Why does each compound have only one composition?
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