the law of definite proportions was proposed by
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The law of definite proportions, together with the law of multiple proportions, forms the basis for the study of stoichiometry in chemistry. The law of definite proportions is also known as Proust's law or the law of constant composition.
Law of Definite Proportions Definition
The law of definite proportions states samples of a compound will always contain the same proportion of elementsby mass. The mass ratio of elements is fixed no matter where the elements came from, how the compound is prepared, or any other factor.
Law of Definition Proportions Example
The law of definite proportions says water will always contain 1/9 hydrogen and 8/9 oxygen by mass.
The sodium and chlorine in table salt combine according to the rule in NaCl. The atomic weight of sodium is about 23 and that of chlorine is about 35, so from the law one may conclude dissociating 58 grams of NaCl would produce bout 23 g of sodium and 35 g of chlorine.
History of the Law of Definite Proportions
Although the law of definite proportions may seem obvious to a modern chemist, the manner in which elements combine was not obvious in the early days of chemistry through the end of the 18th century.
Joseph Priestly and Antoine Lavoisierproposed the law based on the study of combustion. They noted metals always combine with two proportions of oxygen. As we know today, oxygen in air is a gas consisting of two atoms, O2.
The law was hotly disputed when it was proposed. Claude Louis Berthollet was an opponent, arguing elements could combine in any proportion to form compounds.
Hope this helps you...
The law of definite proportions, together with the law of multiple proportions, forms the basis for the study of stoichiometry in chemistry. The law of definite proportions is also known as Proust's law or the law of constant composition.
Law of Definite Proportions Definition
The law of definite proportions states samples of a compound will always contain the same proportion of elementsby mass. The mass ratio of elements is fixed no matter where the elements came from, how the compound is prepared, or any other factor.
Law of Definition Proportions Example
The law of definite proportions says water will always contain 1/9 hydrogen and 8/9 oxygen by mass.
The sodium and chlorine in table salt combine according to the rule in NaCl. The atomic weight of sodium is about 23 and that of chlorine is about 35, so from the law one may conclude dissociating 58 grams of NaCl would produce bout 23 g of sodium and 35 g of chlorine.
History of the Law of Definite Proportions
Although the law of definite proportions may seem obvious to a modern chemist, the manner in which elements combine was not obvious in the early days of chemistry through the end of the 18th century.
Joseph Priestly and Antoine Lavoisierproposed the law based on the study of combustion. They noted metals always combine with two proportions of oxygen. As we know today, oxygen in air is a gas consisting of two atoms, O2.
The law was hotly disputed when it was proposed. Claude Louis Berthollet was an opponent, arguing elements could combine in any proportion to form compounds.
Hope this helps you...
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Lavoiser and Joseph.L.Proust.
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