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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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8y ago
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10y ago

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

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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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Related questions

Composition of inorganic compound?

the composition varies from one compound to another


What is significance of chemical formula?

It shows the composition and the ratio of each element to one another within the compound.


What is the composition of inorganic compounds?

the composition varies from one compound to another


What is the definition of a definite chemical composition?

Definite chemical composition is when a mineral is made of the same material throughout. Basically when a mineral is only made of one material all the way through, not part iron in one part and then gold in the rest.


What does it means when a compounds chemical formula does not include any numbers?

It means that you have one atom of each element in the formula


What does it mean when a compound formula does not include numbers?

there is only one atom of each element


Do compounds always contain the same elements in the ratio?

Yes because no samples are exactly the same.


What is a mineral that is only made up with one element?

A mineral is defined as a compound having a fixed chemical composition ... Thus an element is not a mineral.


What doe it mean when a compounds chemical formula doe not include any number?

This means that each molecule or formula unit of the compound contains only one atom of each element in the compound.


What is the percent composition of a compound with the empirical formula CO2?

One atom of carbon, two of oxygen.


How does the composition of a mixture differ from the composition of a compound?

A pure compound is made up entirely of one substance that has a single chemical property. A mixture is made up of two or more pure compounds with distinct chemical properties.


Do chemical compound contain only one element?

No, compounds contain two or more elements. These elements are bond by ionic or covalent bonds. Compounds have a single chemical composition.