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(physical chemistry)
The numerical relationship of elements and compounds as reactants and products in chemical reactions.



in chemistry, the study of the quantitative relationships between the weights (volumes) of reacting substances. Stoichiometry includes the derivation of chemical formulas and chemical equations, and its principles are used in the calculations of chemical analysis. The term “stoichiometry” was introduced by J. Richter in his book Anfangsgründe der Stöchiometrie (vols. 1–3, 1792–94), in which he synthesized the results of his determinations of the weights of acids and bases during the formation of salts.

The major postulates of stoichiometry are derived from Avo- gadro’s law, Gay-Lussac’s law of combining volumes, the law of multiple proportions, the law of definite proportions, the principle of the conservation of mass, and the law of equivalent proportions. The rules of stoichiometry govern all calculations related to chemical equations. Stoichiometric calculations are widely used in chemical engineering and metallurgy.

References in periodicals archive ?
The algorithm given by Seader and Henley (1998) for conventional distillation columns was modified for reactive distillation columns and incorporated the equations to calculate the extent of reaction.
Even though the way reflectance evolves can be different depending on the wavelength range, the important reflectance variation between 363 K (90[degrees]C) and 413 K (140[degrees]C) is related to the beginning of the reticulation, as the extent of reaction varies from 0.
g]s at zero extent of reaction and complete reaction, respectively, while x and [lambda] are extent of reaction and adjustable parameter, respectively.
Based on the Flory theory [28], the extent of reaction at gelation is constant, so the above equation can be expressed as:
To predict the extent of reaction at the gel point, Flory and Stockmayer used a statistical approach by calculating when the weight average molecular weight becomes infinite [9, 23].
Here, we present the experimental reaction kinetics (conversion or extent of reaction vs.
The initial rate of increase of the extent of reaction in the range of 0 to 700 s (represented by an increase in moduli) is higher at 300[degrees]C than at 270[degrees]C: this confirms similar observations from batch mixer data reported in our earlier publication (5).
Several studies have directly and indirectly shown that not only the extent of reaction of monomers but also the way these monomers are.
In these processes, immediate and continuous information on the extent of reaction and material properties are required for proper control of the process.
in region 2, the extent of reaction depended only on the total strain applied to the melt, but much more strain energy was expended to initiate the chemical reaction at the higher rotor speed.
The extent of reaction [alpha] is represented as a function of the reaction time in the insert to Fig.