law of definite proportion
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The Law of Definite Proportions states that a chemical compound will always have the same proportions or amount of each element by weight, no matter what the amount is, or source.
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Law of Definite Proportions (Law of definite composition): This law was proposed by Joseph Proust. It states that a given compound always contains exactly the same proportion of elements by weight. Or, the same compound always contains the same elements combined in a fixed ratio by mass.
Illustration: Carbon dioxide can be formed in the atmosphere by various methods like respiration, burning of fuels, reaction of metal carbonates and bicarbonates with acid etc. All these samples of CO 2 contain only two elements Carbon and Oxygen combined in a mass ratio 3:8.