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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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11y 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 composed of one type compound?

A pure substance is composed of only one type of compound. Pure substances have a fixed composition and distinct chemical properties.


What information do prefixes in the name of a binary molecular compound tell you about the composition of the compound?

Prefixes in the name of a binary molecular compound indicate the number of atoms of each element present in the compound. The prefixes specify the quantity of each element in the compound, such as mono- for one, di- for two, tri- for three, and so on.


Which is not a characteristic of a compound?

One of the characteristics of a compound is that it has a fixed chemical composition.


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 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.


Is it necessary to know the formula of a compound in order to calculate its percent composition?

No, knowing the formula of a compound is necessary in order to calculate its percent composition. The percent composition is calculated by dividing the mass of each element in the compound by the total molar mass of the compound, which requires knowing the formula to determine the number of atoms of each element present.


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

there is only one atom of each element


Does the composition stays the same or pure substance?

A pure substance consists of only one type of element or compound. The composition of a pure substance always stays the same, with a fixed ratio of its constituent particles.


When you get more than one type of compound in a solid its called a?

When you have more than one type of compound in a solid, it is called a mixture. Mixtures can be homogeneous (uniform composition) or heterogeneous (non-uniform composition).