answer. : One of the basic laws of chemistry is Proust's Law, which is known as the law of constant proportions. Proust's Law was proposed by Joseph Proust, a French chemist. The Law of Fixed Proportions (Proust) states that the elements that make up a chemical compound have a mass ratio that is always fixed or constant.For example: AxBy Compoundmol A : mol B = x : ymass A : mass B = (x . Ar A) : (y . Ar B)
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