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What is the rule of constant proportions?
The law of constant proportions, also called Proust's law, states that the elements in a compound are all present in a fixed proportion by weight, regardless of how the compound is prepared.
Rules of constant proportion?
Proust's law of constant proportions states that a given chemical compound always contains its component elements in fixed ratio (by weight). The ratio does not depend on its source and method of preparation.
When did Dalton publish law of constant composition?
Joseph Proust, based on experiments conducted at the end of the 18th Century claimed that elements combined in constant proportions. Dalton's atomic theory, (1903) built on this earlier work and put it into a theoretic framework.
What proportions mean?
Two quantities are proportional if they vary in such a way that one of them is a constant multiple of the other.
Is the law of constant composition true for all types of compounds?
No, one example would be wüstite. Please see the link.
