1.

The proportion by weight of the constituent elements in different samples of compound is constant. True or false​

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Answer:

In chemistry, the law of definite PROPORTION, sometimes called Proust's law, or law of constant composition states that a given chemical COMPOUND ALWAYS contains its component elements in fixed ratio (by mass) and does not depend on its source and method of preparation. For example, oxygen makes up about 8/9 of the mass of any sample of pure water, while hydrogen makes up the REMAINING 1/9 of the mass. Along with the law of multiple proportions, the law of definite proportions forms the basis of stoichiometry.[1]

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