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what is the law of definite composition

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Key PointsThe law of definite composition was proposed by Joseph Proust based on his observations on the composition of chemical compounds.Proust proposed that a compound is always composed of the same proportions of elements by mass.Though initially controversial,the law of definite composition was supported by Dalton鈥檚 atomic theory.

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  • What does the law of definite composition state?

  • Law of definite composition states that the elements in a given compound are always combined in the same proportion by mass. This law form the basis for the definition of a chemical compound. What is meant by the law of definite proportions?

  • What is the law of definite proportions in chemistry?

  • The law of definite proportions states that a chemical compound always has exactly the same proportion of elements by mass. Joseph Proust, a French chemist, first observed it in 1794. For this reason, it is sometimes called Proust’s law. Amounting to the same thing is the law of constant composition.

  • Who proposed the law of definite composition or proportions?

  • French chemist Joseph Proust proposed the law of definite composition or proportions based on his experiments conducted between 1798 and 1804 on the elemental composition of water and copper carbonate.

  • What is Proust’s law of definite composition?

  • French chemist Joseph Proust proposed the law of definite composition or proportions based on his experiments conducted between 1798 and 1804 on the elemental composition of water and copper carbonate. In 1806, Proust summarized his observations in what is now called Proust鈥檚 Law.

    who discovered the law of definite proportions

    who discovered the law of definite proportions插图

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    Joseph Proust

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  • What is the law of definite proportions?

  • The law of definite proportions was first put forward by the French chemist Joseph Louis Proust in 1779. The discovery that mass was always conserved in chemical reactions was soon followed by the law of definite proportions, which states that a given chemical compound always contains the same elements in the same proportions by mass.

  • What is the law of constant proportions in chemistry?

  • The law of constant proportions states that chemical compounds are made up of elements that are present in a fixed ratio by mass. This implies that any pure sample of a compound, no matter the source, will always consist of the same elements that are present in the same ratio by mass. Which postulate of Dalton鈥檚 theory was correct?

  • What is Proust’s law of definite composition?

  • French chemist Joseph Proust proposed the law of definite composition or proportions based on his experiments conducted between 1798 and 1804 on the elemental composition of water and copper carbonate. It stated that chemical compounds are formed of constant and defined ratios of elements, as determined by mass.

  • What is Richter’s law of definite proportions?

  • In 1792, Richter proposed the law of definite proportions, which gave evidence for the existence of atoms. Richter found that the ratio by weight of the compounds consumed in a chemical reaction was always the same. It took 615 parts by weight of magnesia ( MgO ), for example, to neutralize 1000 parts by weight of sulfuric acid.