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Answer:
In 1797, Joseph Proust proposed the idea of constant proportion.
Statement:
The law of definite proportions, often known as Proust’s law or the law of constant composition, states that a chemical compound’s constituent elements are always present in a fixed ratio (by mass) and do not depend on its source or method of preparation.
Explanation:
The law of constant proportions states that chemical compounds are formed up of elements that are present in a fixed mass ratio, according to the law of constant proportions. This means that no matter from where a pure sample of a compound comes from, it will always have the same elements in the same mass ratio.
