There are, however, exceptions to the Law of Definite Proportions.
2.
Berthollet did not believe that substances always combine in constant and definite proportions as Proust did.
3.
The law of definite proportions might seem obvious to the modern chemist, inherent in the very definition of a chemical compound.
4.
Berthollet was engaged in a long-term battle with another French chemist Joseph Proust on the validity of the law of definite proportions.
5.
But it was found later that Berthollet was not completely wrong because there exists a class of compounds that do not obey the law of definite proportions.
6.
;1797 : Joseph Proust proposes the law of definite proportions, which states that elements always combine in small, whole number ratios to form compounds.
7.
Based on this idea and the atomic theory of John Dalton, Joseph Proust had developed the law of definite proportions, which later resulted in the concepts of stoichiometry and chemical equations.
8.
After long trials I also found a definite proportion between the size of the flag and the size of the white disk, as well as the shape and thickness of the swastika ."
9.
The law of definite proportions and constant composition do not prove that atoms exist, but they are difficult to explain without assuming that chemical compounds are formed when atoms combine in constant proportions.
10.
It is normally partly guarded against in experimental work by subdividing the marks allocated so that a definite proportion is given to say grammatical correctness, or to quality and quantity of material, to order and coherence, to style, and so on.
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