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stoichiometry Line breaks: stoi¦chi|om¦etry
Pronunciation: /ˌstɔɪkɪˈɒmɪtri/

Definition of stoichiometry in English:


[mass noun] Chemistry
The relationship between the relative quantities of substances taking part in a reaction or forming a compound, typically a ratio of whole integers.
Example sentences
  • This relationship, called the stoichiometry of a reaction, can be used to predict how much reactant is needed to create a certain amount of product or to predict how much of the product will be formed from a certain amount of reactant.
  • The relative stoichiometry of the different sequence copies in the parental lines was also studied.
  • Finally, the net reaction may be exothermic or (more commonly) endothermic, depending on reaction stoichiometry.


Early 19th century: from Greek stoikheion 'element' + -metry.

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