Law of definite composition | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-01-16

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Law_of_definite_proportions


00:00:33 1 History
00:02:57 2 Non-stoichiometric compounds
00:04:40 3 See also



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SUMMARY
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In chemistry, the law of definite proportion, sometimes called Proust's law or the law of definite composition, 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.