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The law of constant proportion was given by Joseph Louis proust. It says that in a chemical substance (compound) elements are always present in definite proportion by mass.
For example: In a compound such as water the ratio of mass of hydrogen to the mass of oxygen is always 1:8. Thus, if 9 grams of water is decomposed 1 gram of hydrogen and 8 grams of oxygen are always obtained.
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law of definite proportion sometimes called prousts law or law of constant states that a given chemical compound always contain it's component elements fixed by mass and doesn't depend on its source and method of preparation.
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