A piece of evidence that is commonly used to prove the law of constant composition is that any sample of water is 88. 71 percent oxygen and 11. 19 percent hydrogen. It was formulated by Joseph Proust.
The mass ratio of carbon to oxygen in carbon dioxide is always 3:8 In a molecule of water, the mass of oxygen is always 8 times the mass of hydrogen
No,Law of constant composition is valid only for compounds made from the specified isotopes of the element.
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That is the law of constant composition.
The law of constant composition for compounds is a law in chemistry according to which any given compound always contains the same component elements in the same ratios, by mass. The ratios do not depend on where the compound comes from or the way in which it was produced.
Joseph Louis Proust (1754-1826), In 1799 Proust stated that "Compounds always contain the same elements in a constant proportion by mass." This statement is now called law of definite composition or the law of constant proportion.
Joseph Louis Proust.
The law of constant composition applies to chemical compounds, stating that a compound is always made up of the same elements in the same proportion by mass. This means that the ratio of elements in a compound is fixed and does not change regardless of the source or method of preparation.
In water, there is always 8 times the mass of oxygen than there is of hydrogen.
One drawback of the law of constant composition is that it may not hold true for all substances, especially those with variable composition such as alloys or solid solutions. Additionally, it assumes that compounds are made up of discrete units, which may not always be the case at the molecular level. Finally, the law does not account for isotopic variations in elements.
The scientist who helped prepare the way for Dalton's work by developing the law of constant composition was Joseph Proust. Proust formulated this law, also known as the law of definite proportions, which states that a given compound always has the same elements in the same proportion by mass.
It means that in any pure compound, the proportion of constituent elements (by mass) is a constant. This allows their chemical formulae to be determined.